“A bullet launched at a higher altitude is able to fly slightly farther (in the thinner air) for every increment of downward movement. Effectively, the bullet behaves as if it has a higher ballistic coefficient.”
A few seasons back a good friend ventured to the high country of Colorado to pursue elk. He recently zeroed his rifle in California, at a range just a few hundred feet Above Mean Sea Level (AMSL). He wondered if the higher altitude in Colorado could alter his ballistics. The answer is a definite yes. However the good news is that free ballistics calculators can help you plot reliable drop charts for various shooting locations, high or low.
The question has been posed: “What effect does altitude have on the flight of a bullet?” The simplistic answer is that, at higher altitudes, the air is thinner (lower density), so there is less drag on the bullet. This means that the amount of bullet drop is less at any given flight distance from the muzzle. Since the force of gravity is essentially constant on the earth’s surface (for practical purposes), the bullet’s downward acceleration doesn’t change, but a bullet launched at a higher altitude is able to fly slightly farther (in the thinner air) for every increment of downward movement. Effectively, at higher altitudes, the bullet behaves as if it has a higher ballistic coefficient.
Forum member Milanuk explains that the key factor is not altitude, but rather air pressure. Milanuk writes:
“In basic terms, as your altitude increases, the density of the air the bullet must travel through decreases, thereby reducing the drag on the bullet. Generally, the higher the altitude, the less the bullet will drop. For example, I shoot at a couple ranges here in the Pacific Northwest. Both are at 1000′ AMSL (Above Mean Sea Level) or less. I’ll need about 29-30 MOA to get from 100 yards to 1000 yards with a Berger 155gr VLD at 2960 fps. By contrast, in Raton, NM, located at 6600′ AMSL, I’ll only need about 24-25 MOA to do the same. That’s a significant difference.
Note that it is the barometric pressure that really matters, not simply the nominal altitude. The barometric pressure will indicate the reduced pressure from a higher altitude, but it will also show you the pressure changes as a front moves in, etc. which can play havoc w/ your calculated come-ups. Most altimeters are simply barometers that read in feet instead of inches of mercury.”
As Milanuk states, it is NOT altitude per se, but the LOCAL barometric pressure (sometimes called “station pressure”) that is key. The two atmospheric conditions that most effect bullet flight are air temperature, and barometric pressure. Normally, humidity has a negligible effect. It’s important to remember that the barometric pressure reported on the radio (or internet) may be stated as a sea level equivalency. So in Denver (at 6,000 feet AMSL), if the local pressure is 24″, the radio will report the barometric pressure to be 30″. If you do high altitude shooting at long range, bring along a Kestrel, or remember to mentally correct the radio station’s pressure, by 1″ per 1,000 feet.
Trajectory of Bullet fired at Sea Level
Trajectory of Bullet fired at 20,000 feet
You can do your own experimental calculations using JBM Online Ballistics (free to use). Here is an extreme example, with two printouts (generated with Point Blank software), one showing bullet trajectory at sea level (0′ altitude) and one at 20,000 feet. For demonstration sake, we assigned a low 0.2 BC to the bullet, with a velocity of 3000 fps.
To learn more about all aspects of Exterior Ballistics, Hornady has a useful discussion of External Ballistics including the effects of altitude and temperature. To dig deeper, Sierra Bullets has a comprehensive Exterior Ballistics Resource Page with multiple sections from the Sierra Manual (4th and 5th Editions), including:
Example from Section 3.0: “When a bullet flies through the air, two types of forces act on the bullet to determine its path (trajectory) through the air. The first is gravitational force; the other is aerodynamics. Several kinds of aerodynamic forces act on a bullet: drag, lift, side forces, Magnus force, spin damping force, pitch damping force, and Magnus cross force. The most important of these aerodynamic forces is drag. All the others are very small in comparison when the bullet is spin-stabilized.”
Whidden Gunworks makes great sizing and seating dies. The Whidden full-length sizing die with neck bushing is very popular because it allows you to “tune” the neck tension by using different bushings, with larger or smaller inside diameters. In this video, John Whidden explains how to choose a the right bushing size for use with your neck-sizing and full-length sizing bushing dies.
For most applications, John suggest starting with the caliper-measured outside diameter of a loaded cartridge (with your choice of bullet), and then SUBTRACT about three thousandths. For example, if your loaded round mics at .333, then you would want to start with a 0.330 neck bushing. John notes, however, that you may want to experiment with bushings, going down a thousandth and up a thousandth. With thin In addition, as your brass ages and the necks harden, you may want to change your bushing size.
Quick Tip: Try Flipping Your Bushings
You may also want to experiment with “flipping” your neck bushings to alternate the side that first contacts the neck of the case. (One side of the bushing is usually marked with the size, while the other side is unmarked.) So try “number side up” as well as “number side down”.
Some folks believe that one side of the bushing may allow a smoother entry, and that this can enhance concentricity. Other people think they can get very slightly more or less neck tension depending on how the bushing is oriented. This is a subtle effect, but it costs nothing to experiment.
If one bushing orientation proves better you can mark the “up” side with nail polish so that you can always orient the bushing optimally. NOTE: We have confirmed that some bushings are actually made with a slight taper. In addition, bushings may get distorted slightly when the brand name and size is stamped. Therefore there IS a reason to try both orientations.
Vertical stringing is a common problem that all precision shooters will face sooner or later. In addition to ammo inconsistencies, many other factors can cause vertical stringing. Accordingly, it’s important that you analyze your gun handling and bench set-up systematically.
EDITOR: Folks, READ THIS ARTICLE! You WILL benefit. There are some VERY important insights here. You’ll learn ways to set up your gun better, and check for various technical issues. That can save you time at the range and save you money spent on expensive bullets and powder.
In this article, Hall of Fame benchrest Shooter Speedy Gonzalez explains how to eliminate mechanical and gun-handling problems that cause vertical spread in your groups. Speedy’s article addresses the many human and the hardware factors that can cause vertical.
Speedy Gonzalez, noted shooter, gunsmith and member of the Benchrest Hall of Fame, offers these pearls of wisdom to help you eliminate vertical in your shot strings. Remember that vertical can result from myriad gear issues and gun-handling mistakes. Try to isolate one item at a time as you work to improve your groups.
BAGS and REST–VERY IMPORTANT
• Front Rest Wobble — You will get vertical if the top section of the front rest is loose. Unfortunately, a lot of rests have movement even when you tighten them as much as you can. This can cause unexplained shots.
• Rifle Angle — If the gun is not level, but rather angles down at muzzle end, the rifle will recoil up at butt-end, causing vertical. You may need to try different rear bags to get the set-up right.
• Front Bag Tension–Vertical can happen if the front sand bag grips the fore-arm too tightly. If, when you pull the rifle back by hand, the fore-arm feels like it is stuck in the bag, then the front bag’s grip is too tight. Your rifle should move in evenly and smoothly in the sand bags, not jerk or chatter when you pull the gun back by hand.
• Sandbag Fill — A front sandbag that is too hard can induce vertical. Personally, I’ve have never had a rifle that will shoot consistently with a rock-hard front sandbag. It always causes vertical or other unexplained shots.
• Bag Ears — If the channel between the Rear Bag’s ears is not in line with the barrel, but is twisted left or right, this can affect recoil and vertical consistency. And take note — if the bag is off-axis quite a bit, you can also get horizontal stringing.
• Reliability — ALL your bench equipment must work flawlessly. If it doesn’t, get it fixed or get rid of it. We need all our attention on wind flags.
GUN HANDLING and BENCH TECHNIQUE
• Be Consistent — You can get vertical if your bench technique is not the same every shot. One common problem is putting your shoulder against the stock for one shot and not the next.
• Free Recoil — Free recoil shooters should be sure their rifle hits their shoulder squarely on recoil, not on the edge of their shoulder or the side of their arm.
• Head Position — Learn to keep your head down and follow-through after each shot. Stay relaxed and hold your position after breaking the shot.
• Eyes — Learn to shoot with both eyes open so you can see more of the conditions.
• Last Shot Laziness — If the 5th shot is a regular problem, you may be guilty of what I call “wishing the last shot in”. This is a very common mistake. We just aim, pull the trigger, and do not worry about the wind flags. Note that in the photo above, the 5th shot was the highest in the group–probably because of fatigue or lack of concentration.
• Last Shot Low — I hear a lot of discussion about low shots in a group and apparently this occurs a lot on the 5th shot. If your 5th shot that goes out most of the time, you can bet you are doing something at the bench.
• Seating — When possible, bring your own stool so that you can sit comfortably, at a consistent height, every time you shoot.
LOAD TUNING
• Find the Sweet Spot — A load that is too light or too heavy can cause vertical problems. When you’ve tuned the load right, you should see a reduction in vertical. Even 0.1 grain may make a difference, as will small changes in seating depth.
• Primers — If you’re getting vertical, and everything else looks fine, try another brand of primers. And remove the carbon from the primer pockets so the primers seat uniformly every time.
• Case Prep — When you chamfer the inside of your case necks make sure they are smooth enough that they don’t peel jacket material off when you seat the bullet. Bullets with J4 Jackets (like Bergers) and Lapua Scenar bullets seem more prone to jacket scratching or tearing than Sierra bullets.
• Shell Holders — Keep shell holders clean, in both your press and priming tool. I have seen so much dirt/crud in shell holders that the cases end up get sized crooked because the rim is not square to the die.
• Water in Cases — I see people walking around with case necks turned up in the loading block. A lot of the time there is condensation dropping from the roof of your loading area. If one drop of water gets in a case you are in trouble. How many times have you had a bad low shot when it has been raining and you have been walking around with your cases turned up in your block?
MECHANICAL and HARDWARE ISSUES
• Barrel Weight — A lot of rifles are muzzle-heavy. Some rifles have too heavy a barrel and this causes vertical, especially when shooting free recoil. Basically the gun wants to tip forward. The remedy is to trim or flute the barrel, or add weight in the rear (if you can stay within weight limits).
• Unbalanced Rifle — If the rifle is not balanced, it does not recoil straight, and it will jump in the bags. If the rifle is built properly this will not happen. Clay Spencer calls this “recoil balancing”, and he uses dual scales (front and rear) to ensure the rifle recoils properly.
• Firing Pin — A number of firing-pin issues can cause vertical. First, a firing pin spring that is either too weak or too strong will induce vertical problems. If you think this is the problem change springs and see what happens. Second, a firing pin that is not seated correctly in the bolt (in the cocked position) will cause poor ignition. Take the bolt out of rifle and look in the firing pin hole. If you cannot see the entire end of firing pin it has come out of the hole. Lastly, a firing pin dragging in bolt or shroud can cause vertical. Listen to the sound when you dry fire. If you don’t hear the same sound each shot, something is wrong.
• Trigger — A trigger sear with excessive spring load can cause problems. To diagnose, with an UNLOADED gun, hold the trigger in firing position and push down on sear with your thumb. If it is hard to push down, this will cause vertical problems.
• Stock Flex — Some stocks are very flexible. This can cause vertical. There are ways to stiffen stocks, but sometimes replacement is the best answer.
SCOPE ISSUES
• Lock Rings — This year alone I have seen nine lock rings on scopes that are not tight. Guess what that does to your group? Make sure yours are tight.
• Big Tubes Need Tension — We’ve observed that some 30mm scope rings are not getting tight enough, and scopes are slipping in the rings under recoil. This will cause point of aim movement.
• Windage Bases — If you’re using a conventional-style single dovetail with rear windage adjustment, make sure both sides of the windage screws are tight. This can induce both windage AND vertical issues since the rear ring is held down by the windage tension.
AWARENESS of CONDITIONS and READING WIND
• Basic Wind-Reading Rule–If you do not know how to read wind flags or are very inexperienced, try to shoot your group with the flags all going in one direction.
• Rate of Fire — The longer you wait between shots when a condition is changing, the more the condition change will affect your shots.
• Look Far and Wide — Learn to look at the whole field of flags, not just the row in front of you. Many times a change quite a ways out will cause shot to go out of your group well before that change shows up in front of your bench.
• Don’t Fear the Wind — When you realize that the wind is your friend you will become a much better benchrest shooter. By this I mean that wind skills can separate you from other shooters who have equally good equipment. To learn how to read the wind, you must practice in challenging winds, not only in good conditions.
• Watch Wind Direction AND Velocity — Pay attention to angle changes on flags. Even though you see the same windspeed indicators, angle changes make a big difference in your groups.
• Watch While You Wait — Between courses of fire, whenever possible, watch conditions on the range. That way you will be aware of any changes in conditions since your last group and you will be mentally prepared for the new condition.
SPECIAL ADVICE for HUNTING RIFLES
• Clean That Barrel — Most hunting rifle barrels do not get cleaned enough. If you keep barrel clean it will shoot better for you. You should clean your barrel well after every 10 to 12 shots. If you’re lazy, just use Wipe-Out.
• First Shot Inconsistency — Most hunting rifles will not put the first shot (after cleaning) with the subsequent shots. So, after cleaning, if you have a rifle that tosses that first shot high or wide, then shoot one fouling shot before going hunting or before you shoot for group.
• Barrel Heat — Thin-contour “sporter” barrels WILL change point of impact as they heat up. When testing loads for your hunting rifle, take your time and don’t let the barrel get hot on you.
The USA F-Class National Championships are underway right now in Lodi, Wisconsin. The Mid-Range Championships run August 10-13, 2024, while the Long Range F-Class Championships start on the 14th and run through August 17, 2024. With the Mid-Range event underway today, as you read this, top F-Open and F-TR shooters are aiming their rifles at 600-yard targets. VIEW Nationals Match Program HERE.
2024 NRA F-CLASS NATIONAL CHAMPIONSHIPS
NRA F-CLASS MID-RANGE NATIONAL CHAMPIONSHIP AUGUST 10-13, 2024
NRA F-CLASS LONG RANGE NATIONAL CHAMPIONSHIP AUGUST 14-17, 2024
Event hosted by Winnequah Gun Club and sponsored by Brux Barrels, Criterion Barrels, Krieger Barrels, and Silver Mountain Target.
There will be two divisions at The F-Class National Championships: F-Open and F-TR. In F-Open the rifles can shoot any cartridge type (up to .35 caliber) and have a 22-lb (10kg) weight limit. A front rest is allowed, and most shooters favor a rest with a joystick control.
In F-TR, two cartridge types are allowed: .223 Remington (5.56×45) or .308 Winchester (7.62×51 NATO), with no restrictions on bullet weight. F-TR rifles are fired off a bipod attached to the rifle’s fore-end. The F-TR weight limit is 8.25 kilograms, or about 18 pounds. This includes the weight of the rifle, scope, and bipod. A sandbag can be used under the rear of the stock. Because of the lower weight limit, which includes the bipod, F-TR stocks tend to be much slimmer and lighter than F-Open stocks which have wide fore-arms to work with the front rests.
F-Open Cartridge Options — Modern Magnum Options
For Today’s Sunday Gunday Story we feature an article about F-Open chamberings by respected rifle builder and past F-Open National Champion Emil Kovan. In this article, Emil reviews some of the new magnum cartridge options that are being employed by F-Open competitors. Many shooters are still using the .284 Winchester (or variants), but an increasing number are shooting 7mm and .30-caliber cartridges based on magnum cartridge types. The 7mm is probably still the favored caliber for F-Open because 7mm bullets offer great ballistics with less recoil than heavier .30-caliber projectiles.
Cartridges for F-Class Part II — Rise of the Magnums
A few seasons back, I wrote an article on cartridge choices for F-Class shooters. CLICK HERE to READ ARTICLE. Since the first article I wrote, F-Class has continued to grow, and push the limits of precision and accuracy. While the .284 Win and its variants are still the most common F-Open cartridges, more and more top F-Open shooters are using magnum cartridge types to win competitions and set new records. In this article, I will list some of the advantages and disadvantages of the most commonly used magnums, and will cover the strengths and weaknesses of each one of them.
Performance factors we will consider for magnum F-Open cartridges include:
1. Equal or better accuracy than standard chambers
2. Better ballistic performance
3. Enhanced case life
4. Barrel life
Accuracy Potential of Magnum Cartridges for F-0pen Competition
John Meyrs has won four National Mid-Range Championships using the .300 WSM. Tim Vought used the same cartridge to win two Mid-Range Nationals and used a 7-6.5 PRC to win the long range Nationals. Standard .437″ case head (.308 Win head size) cartridges still have more Nationals wins overall, but the magnums are quickly catching up, and my prediction is that magnums will dominate soon.
The accuracy and precision potential of magnums used in F-Class (.300 WSM, 7-270 WSM, 7mm RSAUM or “7 SAUM”, 7-6.5 PRC) is better than non-magnum cartridges because their shapes are closer to the ideal “fat/short” body associated with wider nodes and extreme precision. For example a .300 WSM is proportionally much closer to the 6 PPC, 6 Dasher, and 6 BRA than is the .284 Winchester.
Stunning F-Open rifle with SEB Mini front rest with Blake Machine accessories.
The first thing that comes to mind when magnums are discussed is power and speed. In my humble opinion most shooters are missing out on accuracy because they push their magnums right past the most stable and accurate nodes. Recently I met my good friend from the Army Marksmanship Unit, SFC Brandon Green, at a shooting competition. We discussed the latest and greatest in long-range shooting. I knew that the USAMU had switched from 6.5-284 Norma to 7mm RSAUM several years back, but didn’t know what load they are currently using. Brandon told me that the load featured Berger 180gr hybrids in Nosler cases at 2820 fps. We all know that the 7 SAUM is capable of much higher speeds, “but at around 2820 fps the load/rifle combo will hammer the X-Ring anywhere under any conditions” SFC Green said.
F-Open rifles on the firing line at the Ben Avery Shooting Facility in Phoenix, Arizona.
Most shooters jump right into magnum territory velocities when testing, missing out on better precision at standard chamber speeds. For example, my 30 KMR can easily reach 2880 fps with 230gr Hybrids, and it actually shoots pretty good. But the same rifle at around 2770 fps will absolutely hammer the X-Ring in any condition anywhere. When it’s all said and done, F-Class is a long-range shooting competition at a known distance which requires extreme precision and accuracy. It is not a speed race.
IMPORTANT — Case-Head Dimensions Do Make a Difference
Magnums, when shot within reasonable velocities, on average will give better case life due to the bigger case + lower pressure and “more meat” in the case-head area. For example a 7 SAUM case will outlast a .284 Win case when both are loaded to around 2900 fps.
Disadvantages of Magnum F-Open Cartridges
Perhaps the biggest disadvantage linked to magnums is recoil. Some people complain about developing the “gun shy” syndrome after shooting a magnum for a while. Muzzle blast and recoil are significantly more pronounced in magnums, but that can be easily managed with a properly-built rifle equipped with appropriate recoil mitigation hardware such as RAD and the various butt plates.
F-Open rifle equipped with recoil reduction buttpad system.
Barrel Life — “Barrels are Expendable Components”
It is true that certain magnums can torch a barrel in just a few hundred rounds. But the same is true when improving a 6BR to 6 Dasher for example — barrel life might be reduced significantly. More powder = more heat = diminished accuracy after a certain round count. In my experience, a F-Open magnum’s barrel life is very close to high-performance standard cartridges such as the .284 Shehane or .284 KMR. I “retire” my barrels around 1200 rounds regardless of the cartridge being a magnum or not. After that many rounds most barrels will still shoot OK but will copper up, and you will start seeing those unexplained vertical 9s. The bottom line is this, barrels are expendable components very much like brass. You can’t get the performance of .300 WSM and the barrel life of the .308 Win at the same time. If you want to race in NASCAR, fuel mileage should not be the top priority!
Top Magnum Cartridge Types Used in F-Class Open Division
.300 Winchester Short Magnum
The .300 WSM (Winchester Short Magnum) tops the popularity chart in F-Class Open division. It has been used to win numerous National championships and has set many National records. The .300 WSM’s short/fat case shape, with minimal body taper and 35-degree shoulder, contribute greatly to its outstanding performance at long range. Components are readily available as well. Best brass remains to be Norma, although ADG is just as good and some would even say better, but it is more expensive and harder to get at this time.
The .300 WSM has been described as a “super-sized Dasher”.
For the .30-cal magnums, in my opinion, the best bullets by far are made by Berger. If your rifle does not shoot 215gr, 230gr hybrids, or 210gr VLDs well, you likely have a rifle problem, NOT a bullet issue. My “go to” bullet is the Berger 230gr Hybrid. The 215-grainer is a close second, followed by Berger’s accurate but ballistically inferior 210gr VLD, which I use in calm and steady conditions.
Top powders for the .300 WSM are Hodgdon H4831SC and H4350. I know there are many more powders suitable for the .300 WSM cartridge, but none I have used can match Hodgdon’s consistency when shot in different geographical locations and weather conditions.
7mm Remington Short Action Ultra Magnum
The 7mm RSAUM (aka 7 SAUM) used to be the darling of F-Open. Its case capacity and shape are about perfect for launching 180gr pills with great ballistics and precision. Its popularity faded a little, due to the lack of good brass, and the rise of the improved versions of the .284 Win which can almost match the RSAUM performance. Norma still makes 7 RSAUM brass which is pretty good but little on the soft side and hard to find. ADG is arguably producing the best RSAUM brass right now. It is very uniform, reasonably priced, and seems to hold up very well even when pushed hard. The best bullets are again made by Berger, and those are the 180gr hybrid, 184gr hybrid, and 180gr VLD. Best powders are H4831sc, H4350, and Alliant Reloder 16 and Reloder 23.
7-270 WSM, 7-300 WSM, and 7 WSM
The first two are pretty much identical, the only difference being that the 7-270 WSM is necked up .270 WSM while the 7-300 WSM is a .300 WSM necked down to 7mm. I personally prefer the first one since necking-up is easier than necking-down (with fewer doughnut issues).
The WSM case-based 7mms will give you great velocity flexibility as well as superb precision when tuned well. In the 2013 world championship in Raton NM, I was scoring for a gentleman from Canada who was shooting 7-270 WSM. The wind was blowing pretty hard that day. On one of his shots, just before he pulled the trigger the wind gusted. I remember thinking that’s going to be an 8 for sure. The target came up a line 10! I asked him after the match what he was shooting, and he replied 180s at 3100fps. Although capable of such speeds, I think that potentially better and more consistent accuracy can be achieved at much slower speeds. The best powders and bullets are again Hodgdon and Berger respectively. Best cases are made by Norma and ADG, with Winchester being a third option.
7-6.5 PRC — Popular Wildcat
Last but not least on our chart is the 7-6.5 PRC. This particular cartridge is actually a wildcat. It is a 6.5 PRC necked up to 7mm. It is pretty much identical to the 7 RSAUM with the only differences being a shorter neck and .01″-narrower body. Currently the 7-6.5 PRC is the most requested cartridge that I offer when building new rifles. It seems to fill the gap between the .284 Win and the larger magnums very nicely. It is capable of reaching 3000fps but most shooters are getting their best results around 2920-2950 fps. The biggest advantage of this wildcat is brass. Lapua makes super high-quality, readily-available 6.5 PRC brass. Best powders are H4831sc, H4350, Reloder 16, and Vihtavuori VV 555. The best bullet in my opinion is the 180gr Berger. I am yet to hear about a better-performing bullet in this chamber.
Conclusion In conclusion, magnums are not perfect but their performance advantages should be very seriously considered when building a rifle for long-range F-Class. In part three, I will list the most common wildcat magnums, and present the KMR magnums which will make you (if you haven’t already) buy a magnum action and get a magnum build for sure!
– 2014 F-Class Open National Champion
– 2015 F-Class Open National Championship, Silver Medal
– F-Class Open National Championship Teams, 2015, 2014, 2013, Shooting Team Member
– Over 15 wins in Regional and State Championships in Palma, F-TR, F-Open
– 2013 U.S. National Team Member
– 2023 F-Open Gold Medal Team USA Member, 2023 World Championship in South Africa
This custom war wagon hauls varmint hunters around the Longmeadow Game Resort in Colorado. Bottom image by Forum member Randful, Big Horn Mountains, Wyoming.
Will you be heading to the varmint fields this summer? Proper planning is key to a safe, satisfying, and productive varmint holiday. Bring a variety of rifles if possible — you’ll need to switch off as one barrel gets hot, and the chambering that works best for your close shots may not be ideal for those longer shots out past 400 yards. Here’s one tip that can help you shoot more effectively on your varmint hunt — at your shooting station, put a strip of surveyor’s tape on a tall stake to show the wind direction. Then align to the wind direction, so that it is a direct headwind or tailwind. This will minimize the effect of cross-winds.
For fans of varmint hunting, we’ve assembled eight videos for this Saturday at the Movies Feature. You’ll see a variety of rifles being used in classic American varmint country — Montana, Oregon, and the Dakotas. We’ve also included an interesting video from South Africa.
Extreme Outer Limits — Oregon Adventure with .22 Creedmoor
This varmint safari video features the Extreme Outer Limits squad in Central Oregon. The host is shooting the .22 Creedmoor cartridge from a 22″ Benchmark barrel. The shooters benefit from a great operation, with elevated mobile shooting stations and benches. Watching this video made this Editor want to travel up to Oregon this summer, and try out a .22 Dasher that’s been sitting in the safe.
This video has plenty of action, with hits on small varmints (mostly ground squirrels) out to considerable distances. You can see the effectiveness of the .22 Creedmoor cartridge — it basically vaporizes some of the critters.
.22-250 Nails Ground Squirrels and Rock Hyraxes in South Africa
Here’s an interesting video from South Africa. The video maker starts with shots on ground squirrels. His .22-250 blasts them into little pieces. They he switches to more distant targets, a furry ground-hog size animal called the Rock Hyrax, Cape Hyrax, or Dassie. Mature Rock Hyraxes weigh 4-5 kilograms and have short ears and tail. These Rock Hyraxes are found at higher elevations in habitats with rock crevices, allowing them to escape from predators (but not skilled varmint hunters).
1125-Yard Rockchuck Hit with Extreme Outer Limits
Here a team from Extreme Outer Limits tests their skills at Extreme Long Range Varminting. The group set up benches and aim their rifles at a distant hillside over 1100 yards away. You can see a successful first-shot rockchuck hit at the 5:15 time-mark. On this episode of Extreme Outer Limits, Bob Beck, Tim Titus, and some MOA Rifles clients to put the .22 Creedmoor and other MOA-brand rifles to the test. At these long distances, Rockchucks are relatively small targets providing plenty of challenge.
Long Range Rockchuck Adventure with Gunwerks Crew
This Gunwerks video showcases varmint hunting in the Western USA. In this video Aaron Davidson and the Gunwerks crew try out some new rifles on some rockchucks. Most of the the rifles were suppressed but the host said the rockchucks took cover after the first shot, so this required good coordination among shooters and spotters. A 6XC varminter is featured at 2:44 and there’s some nice drone footage starting at 2:00.
Varminter.com — Great Resource for Varmint Hunters
Varminter.com is a great resource for serious varmint hunters. This site regularly reviews rifles, optics, and varmint ammunition. In addition, the site’s founder, Eric Mayer, often ventures out in the backcountry to film his varmint adventures.
Varminting with .17 HMR Savage A17 and Custom .17 WSM AR
On varmint excursions, we like to have a .17 rimfire for the closer shots, inside 150 yards. This video shows a successful Prairie Dog hunt with a .17 HMR. Watch and you’ll see hits out to 160 yards (00:50), proving the effective range of the .17 HMR cartridge. The host is shooting a Savage A17 semi-auto 17 HMR rifle in a Boyds laminated stock.
Varminters now enjoy three .17-caliber rimfire options. The .17 Mach 2, .17 HMR, and .17 WSM are all good choices, with the 17 Mach 2 being the cheapest and the .17 WSM the most powerful. With a rimfire you save on ammo costs and you don’t waste precious centerfire barrel life. Also the noise is reduced so you don’t spook the critters so much. We have shot ground squirrels with both the 17 HM2 and .17 HMR. And with a 3000 fps MV, the .17 WSM has some really impressive ballistics. As you can see, the .17 WSM has a much flatter trajectory than both the .17 HMR and .22 WMR:
Last but certainly not least, this video from Eric Mayer, founder of Varminter.com and AR15Hunter.com. This video features an innovative AR-platform rifle chambered for the potent .17 Winchester Super Magnum (aka .17 WSM) cartridge. Eric was able to have instant kills out to 200 yards. This rifle features a Franklin Armory F-17 V4 upper with a Franklin Armory 10-rd magazine. Eric was very impressed with the .17 WSM and he believes the 20gr bullet with 3000 fps MV will be very effective for most of his small varmint hunting out to considerable distances.
KILL Shots — BONUS Age-Restricted Videos
Linked below are a couple very good varminting videos that show explosive hits. However, YouTube has decided these can’t be posted on third-party websites so you’ll have to click the links below to see the Prairie Dogs going airborne. In the first video, the lady shooter nails THREE P-Dogs with one shot!
1. Eastman’s Hunting Journals. Great Video from Eastern Montana. This has nice Aerial Footage and an amazing shot with three P-dogs (in line) dropped with a single shot (at time-mark 9:28). One shot — THREE prairie dogs down! This prairie dog hunt features slow-motion kill shots, digiscope close-ups, and a rare prairie dog triple kill. A group of hunters works to remove prairie dog pests from private grazing lands in this episode of Beyond the Grid by Eastmans’ creators of Eastmans’ Hunting TV. You’ll have to CLICK HERE to watch this video. See Also Eastman’s Prairie Dog Armageddon video.
TEN Shots in 0.303″ (0.289 MOA) at 100 Yards
Look at that target showing TEN shots at 100 yards, with eight (8) shots in the main cluster at the top. The ten-shot group measures .303″ (0.289 MOA), as calculated with OnTarget Software. Not bad for a handgun — a very nice bolt-action XP-100 pistol! What do you think, can your best-shooting rifle match the 10-shot accuracy of this XP-100 pistol?
Report by Boyd Allen
This story goes back a few seasons… this remarkable XP-100 pistol belongs to Dan Lutke, a Bay Area benchrest shooter who publishes the results for the Visalia matches to the competitors and the NBRSA. He has been an enthusiastic competitor for an number of years, at various ranges, notably Visalia and Sacramento. The action is a Remington XP-100, to which a Kelbly 2 oz. trigger has been fitted. On top is an old Japanese-made Tasco 36X scope (these were actually pretty darn good). The Hart barrel (a cast-off from Dan’s Unlimited rail gun) was shortened and re-chambered for the 6x45mm, a wildcat made by necking-up the .223 Remington parent case. The custom stock/chassis was CNC-machined by Joe Updike from 6061 Billet Aluminum to fit the XP-100 action and mount a target-style AR grip with bottom hand rest. The gun was bedded and assembled by Mel Iwatsubu. In his XP-100 pistol, Dan shoots 65gr custom boat-tails with Benchmark powder.
This diagram shows the most common 6x45mm wildcat, which is a necked-up version of the .223 Remington parent cartridge. NOTE: The dimensions for Dan Lutke’s benchrest version of this cartridge may be slightly different.
ACAD drawing by Peter Gnanapragasam CC by SA 3.0, via Wikimedia Commons. Title Added.
At the request of our readers, we provide select “Deals of the Week”. Every Sunday afternoon or Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.
NOTE: All listed products are for sale to persons 18 years of age or older. No products are intended for use by minors.
1. Bullet Central — Save 7% Site-Wide
⏺ Save on ammo, bullets, brass, dies, actions, optics, barrels, and more
Bullet Central is a great source for products for competitive shooting and game hunting. Bullet Central carries top products and now you can save 7% off EVERYTHING with code FCLASSJOHN7. This is a great time to pick up components, actions, and more and save money on items you rarely see on sale.
2. CDNN Sports — Ruger American Gen II with Scope, $599.99
⏺ Great deal on modern hunting rifle with Bushnell scope
Need a rifle for your fall hunt? Save $199 on this Ruger American Rifle at CDNN Sports. For $599.99 this gray-stocked rifle comes complete with a 4-12x40mm Bushnell hunting scope, and 20″ fluted barrel (with brake). Choose .204 Ruger, .223 Rem, .243 Win, .308 Winchester, or .450 BM chamberings. In addition, for the same $599.99 price, there are versions with FDE tan stock or green stock and 16.1″ or 16.4″ barrels offered in .223 Rem, 300 Blackout, and .450 BM. All these Ruger American Gen II rifles come with 4-12x40mm Bushnell scope and rings, adjustable trigger, and Cerakote metal finish.
3. Creedmoor Sports — Peterson Cartridge Brass Sale
⏺ Large selection of strong, long-lasting cartridge brass
Peterson crafts quality, long-lasting made-in-USA cartridge brass. Right now you can get major savings with the Peterson Brass Sale at Creedmoor Sports. You’ll find a wide selection of cartridge types, many offered at 15% Off — a significant discount.
4. Natchez — Reloading Press and Press Kit Sale
⏺ Major savings on reloading presses, combo kits, and progressives
Natchez is running a big Reloading Press and Press Combo sale. Save up to $155 on Press Combo sets from RCBS, Hornady, and Lyman. These combos can include press, scale, priming tools, powder measures and more. There are also deals on multi-stage progressive presses from Lee and Hornady. And if you just need a single-stage press, there are big savings on RCBS, Lee, Redding, Lyman, and Hornady presses. For example, you can get the RCBS Rock Chucker Supreme for $199.99, $42 off the regular price.
5. Midsouth — .308 Cal 168gr BTHP Bullets, 250 for $64.99
⏺ Good .308 practice bullets for just $26 per 100
Quality .308-caliber bullets can be expensive. If you practice frequently with a .308 Win or .30-06 rifle, consider these Classic Match Bullets from a major American bullet-maker. These bullets are a good choice for Garand or Modern Military rifle shooters who practice often. And the price is great — just $64.99 for 250 bullets. That works out to just $0.26 per shot. NOTE: If you want to test these bullets first, you can get a 25-count Sample Pack for just $9.00.
⏺ Top choice for PRS/NRL competition, plus 15% Off Code
For NRL22 or PRS/NRL matches, you’ll want a FFP scope with 0.1 Mil clicks. While you can spend over $2k on a suitable optic, we suggest getting the Vortex Strike Eagle 5-25x56mm for $799.99. This has good glass, a handy EBR-7C “Xmas Tree” reticle, and great owner reviews: “You cannot find a better scope for this price. Great glass and built sturdy with 34mm tube”; “Best bang for your buck. Clear glass, turrets track extremely well”; “[Great] for NRL22 … consistently repeatable when dialing for distance. Highly recommend.” To make this deal even better, EuroOptic offers free 2-day shipping, PLUS you get 12% Off with Code VTX12. That lowers your net cost to $703.99, a $96 savings.
7. Palmetto State Armory — TaurusTX 22 .22 LR Pistol, $249.99
⏺ Amazingly low price on rimfire pistol with good accuracy and ergonomics
With .22 LR rimfire pistols you can enjoy target shooting for a fraction of the ammo cost of centerfire handguns. And the low rimfire recoil is good for developing your shooting skills. Right now, the nicely-designed TaurusTX 22 Pistol is on sale at a bargain price — just $249.99. This gray-framed pistol has a good ergonomic grip and a crisp trigger. Owners report the TX 22 is very reliable and quite accurate.
Having a reloading scale with a built-in trickler makes loading faster and more efficient. If you need a compact scale, consider this Reloading Basic ERS2000 Electronic Scale (#ad). This unit reads up to 2000 grains with 1/10th grain accuracy. The included powder trickler mounts securely on the top of the blue scale housing. This ERS2000 scale comes with a convenient powder tray plus check-weights. NOTE: This unit has a power cord that plugs into a wall socket — it is NOT battery-powered.
9. TargetSports USA — Self-Inking Stamp for Targets, $5.99
⏺ Handy tool to stamp your own 2″ bullseyes on target
Are you tired of buying targets or wasting expensive printer ink just to shoot holes in paper? Consider this Self-Inking Target Stamp. With an easy-to-fill ink reservoir, you can stamp a grid of multiple targets or add 2″ red bullseyes to a printed target. NOTE: This target stamp is listed at 51mm, so it makes bulls 2 inches in diameter.
10. Amazon — Frankford Arsenal Hinged Ammo Box Sale
⏺ Good plastic ammo boxes with hinged lids that open completely
Built for stacking and available for wide range of cartridges, Frankford Arsenal Hinge-Top Ammo Boxes (#ad) work well for factory and/or hand-loaded ammunition. These boxes have a good hinge that prevents the lid from inadvertently closing. The lid clasp also provides a secure closure. Made from high-density polymer, these boxes are strong and durable so they can be stacked.
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A while back, Sinclair International’s Reloading Press Blog featured a “round-table” discussion of reloading techniques. Sinclair’s team of tech staffers were asked: “What do you feel is the one-most crucial step in precision reloading?”
Here are their responses (along with comments from our Editors):
Phil Hoham: “I feel that when working up a load do not go too high or too low in your powder charge. Stay away from ‘suggested loads’ you hear at the range, or on the internet. Always be sure to use a published reloading manual that presents not only minimums and maximums, but also pressure, velocity, and a proper range of powders used. Do not get distracted in the reloading process, and remain focused at all times during each step involved.”
AccurateShooter.com: Some loads presented on the Internet are OK as a starting point, but it is absolutely critical to understand that pressure maximums will vary considerably from one rifle to another (of the same chambering). For example, one 6mmBR rifle shooting 105gr bullets can max out with 30.0 grains of Varget powder, while another rifle, with the same chamber dimensions, but a different barrel, could tolerate (and perform better) with half a grain more powder. You need to adjust recommended loads to your particular rifle and barrel.
Pete Petros: “This could be a very broad topic, but if I were to pick one, it would be making sure to pay close attention, and weigh each and every powder charge to ensure that each load is exact and consistent. This is important not only for accuracy, but also for safety reasons.”
AccurateShooter.com: If you’re shooting beyond 200 yards, it is critical to weigh your loads with an accurate scale or automated system such as the AutoTrickler V3/V4. Loads that are uniform (within a few kernels) will exhibit lower Extreme Spread and Standard Deviation. And remember, even if you stick with the same powder, when you get a new powder lot, you may have to adjust your load quite a bit. For example, .308 Palma shooters have learned they may need to adjust Varget loads by up to a full grain from one lot of Varget to the next.
Ron Dague: “I feel that the most important step(s) in reloading for accuracy are in the initial case prep. Uniforming the primer pocket to the same depth to ensure consistency in primer seating is a crucial step. Additionally de-burring the flash holes, each in the same way to clean up and chamfer the inside is important. It ensures that the ignition from the primer is uniform and flows out in the same consistent pattern. Doing so will create uniform powder ignition and tighten up your velocity Extreme Spread.”
AccurateShooter.com: With some brands of brass, primer pocket uniforming and flash-hole deburring is useful. However, with the best Lapua, Norma, and RWS brass it may be unnecessary, or worse, counter-productive. So long as your Lapua brass flash-holes are not obstructed or smaller than spec, it may be best to leave them alone. This is particularly true with the small flash holes in 220 Russian, 6BR, and 6.5×47 cases. MOST of the flash-hole reaming tools on the market have cutting bits that vary in size because of manufacturing tolerances. We’ve found tools with an advertised diameter of .0625″ (1/16″) that actually cut an 0.068″ hole. In addition, we are wary of flash-hole deburring tools that cut an aggressive inside chamfer on the flash-holes. The reason is that it is very difficult to control the amount of chamfer precisely, even with tools that have a depth stop.
Rod Green: “I feel that bullet seating is the most important step. If you had focused on making sure all prior steps (case prep, powder charge, etc.) of the process have been carefully taken to ensure uniformity, bullet seating is the last step, and can mean all the difference in the world in terms of consistency. Making sure that the bullet is seated to the same depth each time, and time is taken to ensure that true aligned seating can make the load.”
Bob Blaine: “I agree with Rod. I strongly feel that consistent bullet seating depth is the most important step in creating the most accurate hand loads. I have seen the results in both my bench and long range rifles. Taking the time to ensure exactness in the seating process is by far, the number one most important step in my book.”
AccurateShooter.com: Agreed. When loading match ammo, after bullet seating, we check every loaded round for base of case to ogive length. If it varies by more than 3 thousandths, that round is segregated or we attempt to re-seat the bullet. We measure base of case to bullet ogive with a comparator mounted on one jaw of our calipers. You may have to pre-sort your bullets to hold the case-base to ogive measurement (of loaded rounds) within .003″.
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The rifle cartridge money clip was a real product from ReleaseMeCreations.com (now sold out). You can, of course, make your own cartridge money clip with a Dremel tool for free.
At the request of our readers, we provide select “Deals of the Week”. Every Sunday afternoon or Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.
NOTE: All listed products are for sale to persons 18 years of age or older. No products are intended for use by minors.
1. Creedmoor Sports — American Bullet Company Sale
⏺ Great deals on .224 and .308 bullets for training
Creedmoor Sports offers American Bullet Company bullets, made in the USA by major manufacturers. The “practice” bullets are factory seconds, sold at very attractive prices– up to 50% compared to first-run offerings. You may want to sort these practice bullets by weight and/or base-to ogive measurement. We think these are a good choice for M1 Garand, M1A, and 1903 Springfield shooters running .30-06 or .308 Win chamberings. And the .224 Cal 77gr Practice bullets are excellent for service rifle shooters. NOTE: There are also first-run (non-blem) 155gr and 175gr .308 Caliber “Match” Bullets on sale.
⏺ Excellent, rugged rifle case at a very good price
When flying or driving it’s vital to protect your rifles. A good hard case option (at a great price) is the APACHE 9800 Weatherproof Protective Rifle Case. On sale for $149.99, this 53″-long case is $190.00 less than an equivalent-size Pelican case. Constructed from durable polypropylene, this quality hard case can protect long guns from from impact, moisture, and dust. The built-in purge valve equalizes pressure so you can open the case after changing elevations. NOTE: Case interior dimensions are 50⅜” by 13⅝”.
3. Grafs.com — Frankford Arsenal F-1 Press, $103.99
⏺ Versatile press, good primer exit, plus built-in light
Here’s a handy, single-stage press with some cool features. The Frankford Arsenal F-1 press has an open front for easy case placement, plus a built-in LED lamp at the top. And after decapping, spent primers go straight down a tube into a handy, clear, twist-off catch cylinder (as on a Forster Co-Ax). We think this would be an excellent secondary press used for decapping or bullet seating. Priced at just $103.99 at Graf & Sons — this press is a GREAT deal, but act quick, supplies are limited. NOTE: This press does NOT have primer seating capability — you must prime cases with a separate tool. Also, the power cord for the LED light is NOT included. CLICK HERE for full Frankford Arsenal F-1 Press Review.
4. CDNN Sports — Winchester .22 LR Wildcat, $193.67
⏺ Fun rimfire rifle complete with optic — good owner reviews
Here’s a fun semi-auto .22 LR rifle at a crazy low price — $193.67 complete with a mounted Red Dot Reflex optic. That’s a steal for a reliable rimfire rig for plinking and NRL22 matches. The Winchester Wildcat takes Ruger 10/22 mags, and has some great features, such as field-removable lower receiver, ambidextrous controls, integral Picatinny rail, and rear barrel access. It has a good trigger and shoots well. In many respects the Wildcat beats the Ruger 10/22 while costing a lot less. If you don’t need the optic, you can get a basic Wildcat for $179.99 with Strata camo stock or $157.66 with OD Green stock.
5. Natchez — Norma TAC-22 .22LR Ammo, 50 rounds, $3.49
⏺ Very good .22 LR ammo at extremely low price — GREAT VALUE
If you love .22 LR rimfires and want quality ammo at an ultra-low price, grab some Norma TAC-22. At $3.49 for 50 rounds, this is a true bargain, yet the TAC-22 is good enough for NRL22 matches as well as fun target shooting. We’ve shot this Norma ammo and been very satisfied. You’ll be hard-pressed to find better .22 LR ammo at anywhere near this price. Don’t delay ordering — at this price, we expect this TAC-22 ammo will sell out soon. NOTE: On the Natchez website there is a reference to $0.17 per round. That is a TYPO. You get 50 rounds for $3.49, which works out to SEVEN cents per round ($0.0698 to be exact).
6. Amazon — Midland-EX37VP Radio Kit (Set of 2), $49.99
⏺ Quality Walkie-Talkies with good range and special Emergency functions
Having a good 2-way communication system is vital when hunting or wilderness hiking. And a pair of walkie-talkies really helps during shooting practices when a buddy goes downrange to set targets. A very good 2-Way radio system is the Midland-EX37VP E+Ready Emergency Two-Way Radio Kit (#ad). These walkie-talkies have a 26 mile range and feature 22 FRS (Family Radio Service) channels, along with channel scan. With this kit you get vital E+Ready Emergency functionality, plus NOAA weather alerts — important in the event of a natural disaster.
7. Amazon — Caldwell AR-500 Steel Targets, starting at $14.92
⏺ Great deals on durable AR500 steel targets — watch video below right
Caldwell’s bright, easy-to-see steel targets come in multiple shapes and sizes for competition, training, and recreational use. Made of AR-500 grade hardened steel, these bright yellow targets can withstand thousands of rounds. Rated up to a 3000 fps impact velocity and a 3500 ft-lb impact energy, these targets come in seven styles and sizes with three hanging solutions. These bright yellow Caldwell AR500 Steel Targets (#ad) are on sale now on Amazon, starting at just $14.92 for the 5″ Gong Target.
8. Amazon — Deyace Extra Large Shooting Mat, $37.99
⏺ Nice, relatively big shooting mat with good padding
When shooting prone, you need a good shooting mat. The Deyace Extra Large padded shooting mat (#ad) is a great value for just $37.99. Measuring a generous 78″x28.5″, this XL mat has nice padding for elbows and knees, and the mat folds up nicely for transport. This mat is offered in four colors: Green, Tan, Tan Camo, and Black. For transport, we like this mat’s integral straps and carry handle.
How many times have you grabbed your electronic earmuffs only to find the batteries are dead. To avoid the hassles (and cost) of battery replacement, consider Walker’s Rechargeable Razor Ear Muffs (#ad). These rechargeable muffs have an estimated 80 hours of run time. That’s enough to get through several DAYS at the range. Then you can recharge the muffs conveniently at home or in your vehicle. To hear range commands clearly, the muffs have HD speakers. Plus there’s a handy audio jack. These muffs are comfortable and boast a 21 dB Noise Reduction Rating (NRR).
10. Amazon — 6 Inch Calipers w/ Extra Large Screen, $29.98
⏺ Big screen is a big plus with these Digital Calipers
Every handloader can use a good set of digital calipers (#ad). With an extra large, high-contrast LCD display, these Jiavarry digital calipers show bigger numbers that are easier to read. That help ensure you don’t make mistakes. These calipers have a good Lithium battery and offer ample 0-6 inch (0-150mm) measuring range with ±0.02 mm/0.001″ resolution.
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The question has been posed: “What effect does altitude have on the flight of a bullet?” The simplistic answer is that, at higher altitudes, the air is thinner (lower density), so there is less drag on the bullet. This means that the amount of bullet drop is less at any given flight distance from the muzzle. Since the force of gravity is essentially constant on the earth’s surface (for practical purposes), the bullet’s downward acceleration doesn’t change, but a bullet launched at a higher altitude is able to fly slightly farther (in the thinner air) for every increment of downward movement. Effectively, at higher altitudes, the bullet behaves as if it has a higher ballistic coefficient.
Quick Tip: Try Flipping Your Bushings
In this article, Hall of Fame benchrest Shooter Speedy Gonzalez explains how to eliminate mechanical and gun-handling problems that cause vertical spread in your groups. Speedy’s article addresses the many human and the hardware factors that can cause vertical. 
• Front Bag Tension–Vertical can happen if the front sand bag grips the fore-arm too tightly. If, when you pull the rifle back by hand, the fore-arm feels like it is stuck in the bag, then the front bag’s grip is too tight. Your rifle should move in evenly and smoothly in the sand bags, not jerk or chatter when you pull the gun back by hand.
There will be two divisions at The F-Class National Championships: F-Open and F-TR. In F-Open the rifles can shoot any cartridge type (up to .35 caliber) and have a 22-lb (10kg) weight limit. A front rest is allowed, and most shooters favor a rest with a joystick control.
In conclusion, magnums are not perfect but their performance advantages should be very seriously considered when building a rifle for long-range F-Class. In part three, I will list the most common wildcat magnums, and present the KMR magnums which will make you (if you haven’t already) buy a magnum action and get a magnum build for sure!
This varmint safari video features the Extreme Outer Limits squad in Central Oregon. The host is shooting the .22 Creedmoor cartridge from a 22″ Benchmark barrel. The shooters benefit from a great operation, with elevated mobile shooting stations and benches. Watching this video made this Editor want to travel up to Oregon this summer, and try out a .22 Dasher that’s been sitting in the safe.
A while back, Sinclair International’s Reloading Press Blog featured a “round-table” discussion of reloading techniques. Sinclair’s team of tech staffers were asked: “What do you feel is the one-most crucial step in precision reloading?”
