Do you enjoy shooting pistols for sport, or perhaps you carry a handgun for self-defense? If you’re like most of us, you might benefit from a “refresher course” on the fundamentals of handgun shooting. The NRA has created a useful Infographic that covers important basics of handgun marksmanship — key things such as Sight Alignment, Trigger Control, and Handgun Hold.
Here are the first two (2) lessons. Click the link below to see all SIX (6) training topics: Sight Alignment, Sight Focus, Trigger Control, Breath Control, Hold Control, and Follow-Through.
Video Shows Sight Alignment, Grip, Stance, Trigger Control and More
In this USAMU video, SGT Shane Coley talks about the basics of sight alignment and trigger control. But then SGT Coley talks about other important control factors such as grip, arm position, and body stance. For rapid-fire shooting, you need to have a good arm and body positioning to control recoil and get back on target quickly. This video is a valuable complement to the NRA Infographic because it demonstrates all the important pistol fundamentals during live fire, at the range.
A good case trimmer is an essential tool for precision hand-loading. To ensure consistent loads, you want your cases to be the exact same length. Today’s Saturday Showcase features five trimming tools, both powered and manually operated, that can trim your sized brass with great precision. In addition, some of these tools will also chamfer case necks inside and out. The powered case trimmers will save you considerable time (and effort) when working will large batches of brass.
Lead photo shows the Henderson Gen 2 trimmer from Panhandle Precision video review.
Henderson Gen 3 Power Trimmer — Ultimate Reloader Review
Gavin Gear of UltimateReloader.com has tested the impressive Henderson Gen 3 (V3) Trimmer. You’ll find a full write-up on Gavin’s website, and you can watch Gavin’s 18.7-minute video review above.
Gavin states: “The Henderson Gen 3 case trimmer is built on an adjustable tri-trim 3-way cutter with different pilots to accommodate different case necks. Three-way cutters trim to length and chamfer the inside and outside all at once. This trimmer has a 1700 RPM spindle and a custom DC motor made in the USA. The Henderson trimmer works much like a milling machine. You do not need much torque because of the way the taper works. The Henderson Gen 3 trimmer delivered outstanding cartridge length consistency after trimming. This trimmer is fast and easy to use and most importantly, returns consistent results.”
CLICK HERE for Henderson Gen 2 Trimmer video review, which shows how to how to set trim length and change cutter heads, using 6.5×47 Lapua, .260 Remington, and .300 Winchester Magnum cases.
Giraud Power Case Trimmer — Full Review by Erik Cortina
In this video, Erik Cortina of CortinaPrecision.com offers some very clever and useful tips that will help you get the most from your Giraud powered case trimmer. The Giraud trimmer is very precise. When set up correctly, it can trim brass with amazing consistency.
In the video, Erik trims 5 pieces of brass in 15 seconds (6:32 mark). He then measures all five with precision calipers (7:00-8:08). All lengths are exact within .0005 (half a thousandth). Erik notes that the Giraud trimmer indexes off the case shoulder. As long as you have fire-formed brass with consistent base-to-shoulder dimensions, you should get very consistent trim lengths.
Lyman Powered Case Trimmer Review
The Lyman Case Trim Xpress is an efficient, precise unit that allows easy adjustment of trim length with a click-adjustable collar. The trimmer comes with a set of cartridge-specific bushings that index off the case shoulder. One nice feature is a variable speed control. For the price, $146.20 on Amazon, this trimmer delivers excellent performance. To see more details, check out F-Class John’s video review of the Lyman Case Trim Xpress which shows set-up and operation.
Frankford Arsenal Universal Case Trimmer (for Power Drills)
This video features a handy tool that attaches to a portable drill. Used with various diameter collets, this can trim most popular sizes of shouldered brass. The universal collet system indexes on case shoulders for precise and consistent trimming (this does NOT work with straight-walled cartridges). The built-in depth micrometer allows for quick and precise micro-adjustments. There is a handy brass shaving ejection port. The system works well, particularly if you can stabilize your power drill in one position. This Frankford Arsenal trimmer, under $65.00 on Amazon, is an affordable alternative to the top-end powered case trimmers. It comes with a handy plastic case that holds the trimmer and collets.
L.E. Wilson Manual Case Trimmer
L.E. Wilson, makers of hand dies, case trimmers and other precision reloading tools, makes a popular and precise stainless steel case trimmer with micrometer adjustment. The above video explains the operation of the Wilson trimmer and shows how to trim cases and use the micrometer case length control positioned opposite the hand crank. We definitely like the micrometer control. This feature allows you to set the cartridge overall trim length with great precision. If you are trimming a variety of different cartridge types, the micrometer cut length control comes in very handy.
If you own a L.E. Wilson case trimmer, you should watch the official Accessories Video from L.E. Wilson. This video shows accessories for the L.E. Wilson trimmer. These include: Power Adapter for trimming (replaces hand crank), Titanium Case Trimmer Cutter (longer life), Inside Case Neck Reamer, Primer Pocket Reamer (removes military crimps), Uniform De-Burring Tool, Neck Chamfer Tool (30° and 45°), and handheld inside/outside deburring tool (and power adapter).
BONUS Video: How Important is Consistent Case Length?
This Primal Rights video explains why it is important to maintain precise case lengths if you want best accuracy and most consistent ES/SD. You’ll want to size your cases BEFORE trimming if your trimmer indexes off the case shoulders.
This Gun Digest book has become a “go-to” resource for NRL22 and PRS Rimfire shooters. Key topics included in this 2021 Edition full-color Gun Digest book include: rimfire semi-autos and how they work; bolt-action accuracy; match shooting skills; DIY precision gunsmithing; hunting with rimfires; and the future of the rimfire market.
With the growth of rimfire tactical competition, the .22-Caliber rimfire rifle is more popular than ever. Every major gun manufacturer has brought at least one new .22 LR rimfire rifle to the market in the last two years. Gun Digest’s Rimfire Revolution has extensive coverage of new models from major manufacturers.
The .22 Long Rifle (.22 LR) is the planet’s most popular ammunition type and firearm chambering. The .22 LR is used in the Olympics by 3P marksmen, but it also serves benchrest competitors, NRL22 shooters, backyard plinkers, small-game hunters, and tactical trainers. With the expansion of NRL22 matches (and the PRS equivalent), the humble .22 LR is undergoing a major resurgence in the USA. And with centerfire reloading components being so costly and difficult to find, many folks are shooting less centerfire, but way more rimfire.
Plus Coverage of .17-Caliber Rimfire Rifles — 17 HM2, 17 HMR, 17 WSM
This 272-page book also covers .17-caliber rimfire cartridges: 17 HM2 (Mach 2), 17 HMR, and 17 WSM. These are all excellent varmint rounds, with the 17 WSM effective out to 250 yards. The 17 HM2 will run in a normal .22 LR action and feed from standard .22 LR magazines. So, for most rifles, all you need to do a .22 LR to 17 HM2 conversion is a barrel switch. That gives your rimfire rig twice the versatility. Shoot .22s and .17s with the same gun.
NRL22 — Challenging Practical Competition with .22 LR Rifles
The USA has seen a big growth in rimfire tactical matches over the last five years. Right now there are probably ten times as many rimfire tactical matches as sanctioned PRS and NRL centerfire matches. The reason is simple — rimfire ammo is much less costly, and clubs can run challenging rimfire tactical matches at nearly any outdoor gun range that allows shooting out to 200+ yards.
NRL22 Competition — Tactical Rimfire Matches
The NRL22 match format is a great shooting discipline. NRL22 offers a high fun factor at relatively low cost. You don’t have to reload match ammo. A couple of 50-round boxes of .22 LR ammo will get you through the match. While some people bring lots of gear to matches, that’s by choice and not by necessity. You can keep it simple and still be competitive (and win).
Tips for NRL22 Competitors by Jonathan Ocab
I am a match director at my gun club and run our local NRL22 matches. People often ask me for tips for competing in NRL22. First, I recommend getting the course of fire for the month in advance and practicing those stages at the range. Here are other specific tips that should help NRL22 competitors improve their gun-handling and match results.
1. Dry Fire Practice — If you are not able to do live fire practice at the range, I encourage shooters to practice their shooting positions at home via dry fire. Setup props or barricades with pasters or other faux targets on a wall in the garage or inside the house and run through each stage.
2. Scope Magnification Level — The most common issue I see with newer shooters in NRL22 is the tendency to maximize their scope magnification. The timer will start, and the shooter gets into position on a target, but the scope is set to 15x or higher and the shooter can’t find the target. The shooter lowers the magnification, locates the target, and then increases the magnification again, takes the shot, transitions to another target, and repeats the process of decreasing magnification, locating target, etc. Novice NRL22 shooters should try using the mid-range magnification. Try shooting 7x-12x and learn to balance field of view and target image.
Today is the first day of August, the beginning of National Shooting Sports Month (NSSM). Each August, throughout the month, America’s shooters come together to celebrate our sport and get newcomers involved. To help grow the ranks of shooters, the National Shooting Sports Foundation (NSSF) asks you to bring a new shooter to the range in August. That’s a good mission — adding to the ranks of shooters is the best way to preserve our Second Amendment rights.
This month, newcomers can take their first shots, and experienced shooters can invite someone new to the range or help an older shooter rediscover the fun of target shooting. This month-long event involves all the shooting sports — rifle, pistol, and shotgun.
Find Shooting Sports Events Near You
The NSSF’s ShootingSportsMonth.org website offers a comprehensive, searchable database. This lets you search by state, to find ranges, events, and sales promotions near you. Visit the NSSF online database of NSSM shooting events to find matches, clinics, training sessions, special sales — and much more.
Find Shooting Ranges Throughout the USA
The NSSF offers a directory of shooting ranges online. Visit Wheretoshoot.org to get info on thousands of shooting ranges and facilities around the country. In addition, there is a FREE WheretoShoot Mobile App you can install on your phone. Versions are available for both Android and iOS (Apple) users.
To promote National Shooting Sports Month, the NSSF offers 17 FREE Downloadable Targets. There are regular bullseyes, as well as Darts, Golf, and more. We really like the Billiards target and kids love the Water Balloons target. You can download all 17 targets for free, and then print them out, ideally with a color printer. Below are six of our favorite targets. Click HERE to download these six targets (3.5 mb ZIP).
What Shooters Can Do to Promote National Shooting Sports Month:
The NSSF says: “As shooters, you serve a critical role in the continued growth of gun ownership and shooting sports participation. We urge you to join us this August for National Shooting Sports Month.” There are a variety of ways you can help this August:
— Introduce a family member, friend, or group of friends to the shooting sports by taking them to a local range that’s hosting an event.
— Spread the word to family/friends and encourage them to get out to the range in August.
— Encourage the ranges and retailers near you to host an event this August and add them to the official events calendar at www.ShootingSportsMonth.org.
Shown are funnel with ultra-long drop tube (which helps get more kernels in the cases), RCBS Chargemaster (in wood box), and Hood Press (similar to Harrell’s Combo press).
Loading at the range remains important in the Benchrest for Group discipline. In a Special Report below, past IBS President Jeff Stover explains how loading methods (and hardware) have evolved over the years. The advent of accurate, affordable electronic powder dispensers, such as the RCBS ChargeMaster and Frankford’s new Intellidropper, have changed the game and made it easier to load efficiently at the range. And quality manual powder measures are fast and can be very consistent, with a little practice. Loading at the range permits competitors to tune their load to the conditions, change seating depths, or even choose different bullets to suit the barrel’s preferences on any given day.
Although pre-loading is not uncommon, most 100/200-yard group shooters usually load at the match, often between relays. The goal is to shoot smaller groups by staying “in tune”. In a game where 5-shot groups “in the 1s and Zeros” is the goal, tuning loads for the conditions helps deliver match-winning accuracy. Nearly all competitors in this short-range discipline shoot the 6mm PPC cartridge, or a PPC variant.
Loading at the Range — Then and Now
In benchrest shooting for group, loading at the range has been de rigueur for decades. In the Score discipline, preloading is usually the custom. The main reason is that, in Score competition, only one Aggregate (warm-up match and five record targets) per day is usually shot. That would be less than 50 shots, assuming a few sighter shots. Also, the 30BR, the dominant Benchrest-for-Score cartridge, is very amenable to pre-loading.
By contrast, the Group discipline includes 21 targets (two warm-ups and twenty record targets) over a weekend, usually shot with 6PPC-chambered rifles. Many times, the 6PPC shooters may tweak their loads through the day given changing atmospheric conditions or simply trying to find the correct tune to “dot up”. This term, “Dot up”, means the shots are essentially going through the same hole, or closely so.
Loading at the range was a bit different when benchrest competition was in its infancy. The 1951 book, Modern Accuracy by Bob Wallack, is the best of the early benchrest books. Copies can be found, from time to time, on eBay or Alibris. It is a fascinating survey of benchrest as it existed more than six decades ago. There’s even coverage of a controversial target that was argued over at the time. In it, there is a photo of Wallack using the rear bumper of a car at the bench to clamp his reloading tools. Things have come a long way compared to the range loading set-ups of modern shooters. Here you can see Bob Wallack way back in 1950:
Modern loading bench set-ups shown in this Special Report belong to top shooters Howie Levy, Bob Hamister, and Kent Harshman.
We’ve found eight great discount/rebate programs. These specials can save you big bucks on pistols, long guns, suppressors, optics, ammunition, targets and more. Some of these rebates are worth big bucks. For example you can Save $75 on a new Browning rifle or shotgun, Save $100 on a new Colt pistol, get a $100 Credit with a SIG Sauer pistol, or get Free Meprolight Optic with the purchase of an IWI firearm. Note: Quite a few of these rebate offers expire at the end of August or early September, so check the dates — you snooze, you lose.
Find More Rebates at Gundeals.com and Sportsman’s Outdoors. Note: There are Federal, Remington, and Speer Ammo Rebate Offers that expire at 11:59 pm today, July 31, 2025.
Posting on the 6.5 Creedmoor Group Facebook Page, Russel T. complained that his AR magazine doesn’t like to feed that last few rounds. Russell asked: “Full magazine, no problem cycling. But with five (5) or less in the magazine… this happens. What can cause this?”
It sure looks like he could use a new magazine spring, but there may be buffer-related problems as well. Or maybe a gas system issue. What’s your call? Here are some responses posted by Facebook folks:
“Weak mag spring.” — Josh N.
“Weak mag spring or too heavy of a buffer spring.” — Justin G.
“Try a different mag, if it still jams it’s probably a gas problem, if not chuck the bad mag.” — Otto G.
“Weak mag spring or literally anything that would cause the Bolt Carrier Group to short cycle.” — Reggie W.
“I’ve had the same issue with my 300 BLK when my buffer tube came apart. It would still cycle cheap rounds fine but [not] the Hornadys. Took it apart and found the buffer tube was in pieces.” — Hunter R.
“Could be a weak mag spring or buffer spring, both at the same time.” — John S.
“As mentioned it could be a list of things. However, bolt velocity is too fast/hard and the usual (but not always) culprit is over-gassing.” — Bill F.
“Short cycle — clean and LUBRICATE the weapon.” — Mark H.
“Look to see where the brass is ejecting. That will tell if it’s an over or under gas issue. If that’s ok then look at the mag spring. See Diagram” — Teddy G.
“Weak magazine spring, I tossed four brand new ‘bargain mags’ [due to] that very problem.” — John V.E.
“May not be a weak spring or bad mag. Check out a Tubb Precision flatware spring. I swapped mine in a new rifle and solved the problem of short stroking and double feeds.” — Anthony T.
“It might be the follower as well, some designs will dip in the front/rear as rounds are expended. It’s the reason why we didn’t use some service mags with the green followers.” — Chris J.
“Weak spring… time for a new magazine…or add a 5-round block and make it a 25-round magazine. But I’m positive it’s a weak spring, which means it’s just a matter of time for failure.” — Steve M.
“Without the weapon in hand I would hate to guess….
Start with the simple stuff and go from there. Trying to diagnose a problem from a photo is just like when your wife or girlfriend tells you the car won’t start. LOL.” — Mark T.
Coalinga Range in California. At dawn we could clearly see 7mm and .30 Cal bullet holes at 1000 yards.
While attending the CA Long Range Championship a few seasons back, we had the opportunity to test the performance of a high-magnification (63X) spotting scope in near-ideal conditions (maybe the best I’ve ever witnessed). On the event’s last day we arrived at 5:45 am, literally as the sun was cresting the horizon. I quickly deployed our Pentax PF-100ED spotting scope, fitted with a Pentax SMC-XW 10mm fixed-power eyepiece. When used with the 100mm Pentax scope, this 10mm eyepiece yields 63X magnification. Befitting its $299.00 price, this eyepiece is extremely clear and sharp.
At the crack of dawn, viewing conditions were ideal. No mist, no mirage, no wind. The first thing this Editor noticed was that I could see metal nail heads on the target boards. That was astonishing. As soon as the first practice targets went up, to my surprise, I could see 6.5mm, 7mm, and 30-caliber bullet holes in the white at 1000 yards. No lie…
That’s right, I could see bullet holes at 1000. I know many of you folks may not believe that, but there was no mistaking when I saw a 7mm bullet cut the white line separating the Nine Ring and Eight Ring on the target in view. (I was watching that target as the shot was fired and saw the shot-hole form). And when I looked at the 30-cal targets, the bullet holes in the white were quite visible. In these perfect conditions I could also make out 3/8″ bolt heads on the target frames.
The Human Factor — Good Vision Required
When viewing the bullet holes, I was using my left naked eye (no safety glasses or magnification). I also had a contact lens in my right eye (needed for distance vision). To my surprise, while I could see the bullet holes without much difficulty with my left eye, things were fuzzier and slightly more blurry with the right eye, even when I re-focused the scope. That contact lens was degrading the fine resolution.
Then I invited 3 or 4 shooters to look through the scope. One younger guy, with good eyes, said immediately: “Yeah, I can see the holes — right there at 4 o’clock and seven o’clock. Wow.” Some older guys, who were wearing glasses, could not see the holes at all, no matter what we did to the scope’s main focus and diopter adjustment.
The lesson here — if you have to wear glasses or corrective contact lenses, just that extra bit of optical interference may make a difference in what you can see through the scope. Basically anything that goes between the scope eyepiece and your eyeball can degrade the image somewhat. So… you may be better off removing your glasses if you can still obtain good focus sharpness using the diopter adjustment and focus ring. I did the left vs. right eye test a half dozen times, and I could definitely see small features at 1000 yards with my naked eye that I could not see with my right eye fitted with a contact lens. (I did have to re-focus the scope for each eye, since one had a corrective lens while the other did not.)
Mirage Degrades Image Sharpness and Resolution
The “magic light” prevailed for only an hour or so, and then we started to get some mirage. As soon as the mirage appeared I was no longer able to see raw bullet holes, though I could still easily see black pasters on the black bulls. When the mirage started, the sharpness of the visible image degraded a huge amount. Where I could see bullet holes at dawn, by mid-morning I could barely read the numbers on the scoring rings. Lesson: If you want to test the ultimate resolution of your optics, you need perfect conditions.
Chromatic Aberration Revealed
As the light got brighter and the mirage increased I started to see blue and red fringing at the edges of the spotting disk and the large numerals. This was quite noticeable. On one side of the bright, white spotting disc you could see a dark red edge, while on the other side there was a blue edge (harder to see but still present).
The photo below was taken through the Pentax spotter lens using a point and shoot camera held up to the eyepiece. The sharpness of the Pentax was actually much better than this photo shows, but the through-the-lens image does clearly reveal the red and blue fringing. This fringing is caused by chromatic aberration — the failure of a lens to focus all colors to the same point. Chromatic aberration, most visible at high magnification, causes different wavelengths of light to have differing focal lengths (see diagram). Chromatic aberration manifests itself as “fringes” of color along boundaries that separate dark and bright parts of the image, because each color in the optical spectrum cannot be focused at a single common point on the optical axis. Keep in mind that the Pentax does have “ED” or low-dispersion glass, so the effect would be even more dramatic with a cheaper spotting scope.
If you wonder why top-of-the-line spotting scopes (such as the $3558.00 Swarovski ATS-80 ) cost so much, the answer is that they will deliver even LESS chromatic aberration at long range and high magnification. With their exotic apochromatic (APO), ultra-low-dispersion glass, a few ultra-high-end spotting scopes can deliver an image without the color edging you see in the photo above.
The Pentax PF-100ED is a heck of a spotting scope. Any scope that can resolve bullet holes at 1000 yards is impressive. But if you want the ultimate in optical performance, with minimal chromatic aberration, you may need to step up to something like the 88mm Kowa Prominar TSN-88A with Flourite Crystal lenses ($3999.00 with eyepiece), or the 82mm Leica APO-Televid ($3649.95 with 25-50X eyepiece).
EDITOR’s NOTE: The purpose of this report is to show what is possible… in IDEAL conditions. With this Pentax 100mm, as well as a Swarovski 80mm, we can often resolve 6mm bullet holes at 600 yards. But again, that performance requires really good viewing conditions. By 10:00 am at my range, even with the 100mm Pentax at 75 power, seeing 6mm bullet holes is “iffy” at best. So don’t go out and mortgage the house to buy a $4000 optic with the hope that you’ll be able to spot your shots at 1000 yards. If conditions are anything less than perfect, you’ll be lucky to see bullet holes at 500 yards.
The real solution for very long-range spotting is to set up a remote target cam that broadcasts a video picture to a screen at your shooting station. Among the target cams on the market, we recommend the LongShot LR-3 2-mile UHD. This modern target cam system boasts excellent resolution and incredible range. The LongShot LR-3 target cam is used in major ELR competitions. The Longshot LR-3 currently sells for $999.00 on Amazon.
For the next four days — July 31 through August 3, 2025 — the .30-06 M1 Garands and classic military rifles will fill the firing lines at Camp Perry. The National John C. Garand, Springfield, Vintage and Modern Military Match (GSMM) concludes Saturday, August 2, 2025, followed by an M14 Heritage Match and Vintage Sniper Match on Sunday, August 3rd. SEE CMP National Matches 2025 Calendar.
Some participants will shoot just one rifle type, but there is also a combined GSMM 4-Gun Aggregate. This GSSM Agg encompasses a series of position shooting matches on NRA SR targets at the CMP Nationals. Match scores will be posted on the CMP National Matches Results Page.
This video shows the Garand Match at Camp Perry. The rifles are still the same a decade later…
The annual GSMM event is one of the most popular events at Camp Perry, drawing participants from around the nation. One of America’s top GSSM shooters is Brian Williams, who was profiled in our Daily Bulletin. The 4-gun Aggregate includes M1 Garand, 1903 Springfield/1917 Enfield (or similar bolt rifle), M1 Carbine, and AR-type rifle for “Modern Military”.
GSMM matches attract new shooters as well as older competitors. You don’t need to make a huge investment in rifles or optics. We have friends who have done well with a “box stock” 1903 A3 Springfield they acquired from the CMP decades ago. On the firing line are a mix of seasoned competitors and novice shooters. They all come together to share common interests in marksmanship and historic firearms.
During CMP GSMM matches, CMP staff members are always on hand to ensure safety on the firing line and answer questions. This match is fun and efficient. The electronic targets, with monitors at each station, show shot location/score instantly. And there is no pit duty. Competitors never have to venture downrange to change or retrieve targets.
E-Targets at 2025 CMP National Matches
After years of testing, the Civilian Marksmanship Program (CMP) will make full use of eTargets at the 2025 National Rifle Matches at Camp Perry, which run July 20 through August 9, 2025. The advanced Kongsberg eTargets will be used at all Highpower rifle matches, National Trophy Rifle competitions, and Rifle Games events. In addition the eTargets will be used for the Rimfire Sporter Match on July 20 and the National Mid/Long Range Matches in August. The use of eTargets eliminates the need for pit duty, drastically cutting down the duration of each match. CLICK HERE to learn more about Camp Perry eTargets.
The Tactical Rifle Shooters Facebook Group recently showcased tools used to measure case headspace before and after “bumping” the shoulder. After a case is fired, hand-loaders who full-length size their cases will typically bump the shoulders back anywhere from .001″ to .0035″, depending on the rifle and application. With our 6mmBR and Dasher cases we like about .0015″ bump.
You want the amount of case sizing and bump to be the same for all your brass. To ensure uniformity, it makes sense to measure your cases before and after the FL sizing process. When we have time, we check every case. Other folks will simply check the first 3-4 cases coming out of the FL sizing die to ensure the FL die setting is correct and delivering desired headspace/bump.
Whidden Gunworks Shoulder Bump Gauge
There are a variety of tools that can be used to measure shoulder bump. Our favorite is a special cartridge-specific bushing made by Whidden Gunworks. The Whidden Shoulder Bump Gauge enables you to adjust your sizing die to the desired measurement. The bump gauge is attached to your calipers with a set screw and determines the measurement from the base to the shoulder of the case. The photo below, from Tactical Rifle Shooters, shows the Whidden Bump Gauge for the .375 CheyTac cartridge.
Dave Manson Vertical Comparator with Dial Read-Out
Dave Manson states: “This tool was designed to make life easier for the advanced shooter and re-loader by allowing precise measurement of ammunition, case, and chamber headspace. With this information, the re-loader will be able to fine-tune clearances and fits between his ammunition and chamber, with resultant improvements in accuracy and case life.” The functions of the Manson Dial Cartridge Comparator are:
1. Measure headspace of factory or reloaded ammunition
2. Quantify chamber headspace by measuring headspace of a fired case
3. Ensure minimal shoulder set-back when setting up re-loading dies
4. Compare base-to-ogive length to ensure consistent bullet-to-rifling relationship.
In addition to the Dial Indicator and Stand, the $180.00 Dial Cartridge Comparator is supplied with multiple Datum Blocks of precise length and inside diameter (.3300″/.3750″/.4000″/.4375″). MORE INFO HERE.
Hornady L-N-L Headspace Comparator System
Hornady’s Lock-N-Load Headspace Comparator system is easy-to-use and handy. You can get a kit with Red bushing-holder body and 5 bushings for $43.99 at MidwayUSA. Hornady explains: “The Lock-N-Load® Headspace Comparator… gauge measures variations in brass before and after firing or re-sizing. It allows for headspace comparison between fire-formed brass and re-sized brass.” IMPORTANT: Hornady states: “To determine the proper bushing diameter for your cartridge, simply add the neck diameter and the shoulder diameter and divide that number by two. Use the bushing closest to that number.” Hornady offers seven: .188″, .240″, .330″, .350″, .375″, .400″, and .420″.
One tip — We have found the Hornady gauges may vary a little from unit to unit even with the same nominal size. If you have more than one gauge for the same cartridge, test each on your brass — you may then note a slight difference in your bump measurements. Mark one and use that consistently. There is also an Anvil Base Kit that mounts to the opposite blade on the caliper. This provides a more stable surface for the base of your case.
L.E. Wilson Case Gage Depth Micrometer
If you are looking for precise “bump” measurements without having to mess with calipers and clamp-on gauge blocks, you may want to consider the L.E. Wilson Case Gage Depth Micrometer (currently $140.00). This takes very precise, repeatable measurements, but you need to know your starting point. The manufacturer explains: “Every reloader should know exactly how much your Full Length Sizing Die is pushing back the shoulder. With the NEW Case Gage Depth Micrometer you can do just that! It has never been easier to measure you cases headspace before and after sizing. The Depth Mic allows you to slip the micrometer perfectly over the top of the Gage with your case inserted into the Gage and take a measurement. Micrometer has graduations of .001″. The Case Gage Depth Micrometer is set to a zero of .100″ on the scale at our factory. Because of differences in ‘feel’ and temperature, we include a the Gage Block for you to test Zero and to adjust if necessary.”
Pistol Brass Case DIY Bump Gauge
Last is a “field expedient” set-up if you do not have any of the comparator tools shown above. A sized .45 ACP case (or other suitable pistol case) can be used to measure shoulder bump. The mouth of the pistol case sits on the shoulder of your rifle cartridge brass.
Make sure the .45 ACP case is trimmed square and that it is round. We recommend you first run it through an expander, then size it, trim it and chamfer. Next, take the .45 ACP case and slip it over the neck of a fired, unsized rifle case with the primer removed. Align the two cases between the jaws of your calipers and note the length from rim to rim (See left photo below).
OK, now you have the length for a fired rifle case BEFORE sizing. Next, take a full-length sized rifle case (without primer) and do the same thing, placing the .45 ACP case over the neck of the FL-sized case (Right Photo). The difference between the two numbers is the amount of “bump” or set-back you are applying to the shoulder. Here the difference is .0015″. The amount of bump you need varies with your chamber and your load, but .0015-.002″ is a good initial setting.
While attending the CA Long Range Championship a few seasons back, we had the opportunity to test the performance of a high-magnification (63X) spotting scope in near-ideal conditions (maybe the best I’ve ever witnessed). On the event’s last day we arrived at 5:45 am, literally as the sun was cresting the horizon. I quickly deployed our 
Then I invited 3 or 4 shooters to look through the scope. One younger guy, with good eyes, said immediately: “Yeah, I can see the holes — right there at 4 o’clock and seven o’clock. Wow.” Some older guys, who were wearing glasses, could not see the holes at all, no matter what we did to the scope’s main focus and diopter adjustment.
Chromatic Aberration Revealed
