Even with high-quality brass from Lapua, Peterson, Norma, Alpha and RWS, occasionally you may find one or two cases per box which have a small flake or obstruction in the flash-hole. This will appear like a thin crescent on one side of the flash hole (see photo). You should inspect ALL new brass before loading to identify any pieces with a partially-obstructed flash hole. It’s a good idea to remove any flake or thin crescent left as an artifact of the flash-hole forming process. Because the flash-hole itself is normally centered and of the correct diameter, it is not necessary to ream the flash-hole to a larger diameter. All you really need to do is remove the small obstruction(s). This can be done quickly with inexpensive tools.
Use a Small Pin Vise to Remove Flash-Hole Obstructions
Folks have asked if there is a tool that can remove obstructions from a Lapua small, BR-sized flash hole without opening the hole size. The Lapua PPC/BR flash hole is spec’d at 1.5mm, which works out to 0.059055″. Most of the PPC/BR flash-hole uniforming tools on the market use a 1/16″ bit which is nominally 0.0625″, but these often run oversize — up to 0.066″.
If you want to just clear out any obstructions in the flash hole, without increasing the flash hole diameter, you can use an inexpensive “pin vise” with an appropriate drill bit. For $5.39, Amazon sells a 10-piece set of cobalt steel 1.5mm drill bits, that matches the Lapua flash hole exactly. Other vendors offer a #53 pin vise drill bit that measures .0595″ or .060″ (depending or source). An 0.0595″ bit is close enough. You can find pin vises and these small-diameter drill bits at hobby stores.
For quite some time, Sinclair Int’l has sold a similar device for small (PPC and BR-size) flash holes. Like the 07-3081 unit for large flash holes, the 073000 Reamer for small flash holes works from the outside, so it can index off the primer pocket. It reams to .0625″, and also costs $29.99. The standard dimension for Lapua 220 Russian and 6mmBR flash holes is 1.5mm or .0590″. This tool will permit standard-size decapping rods with .0625″ tips to work without binding. However, note that both Forster and Redding normally supply .057″ decapping pins with their PPC and BR dies. So, it is NOT necessary to ream your Lapua BR/PPC flashholes, unless you prefer to do so for uniformity. It IS, however, a good idea to check BR/PPC flash holes for burrs before loading the first time.
NOTE: If you purchase either the 073081 or 073000 Sinclair Flash Hole Reamer tools, we recommend you mic the cutter tip before you process a bunch of cases. Sometimes a tip comes through that is oversize. This will ream the flash holes larger than you may intend.
We are well into spring 2026. That means folks will be getting ready for varmint safaris into prairie dog country. Todays’ story may help you choose a cartridge for your next varmint rifle. This Sunday we feature a Cooper chambered for the .204 Ruger — an impressive cartridge with way more speed that a .223 Rem, plus a flatter trajectory.
For many years, Ken Lunde journeyed to South Dakota to visit with his father, and do a little varmint hunting. This article features Ken’s Cooper Model 21 Montana Varminter chambered in .204 Ruger. During past varminting holidays in South Dakota, Ken had a chance to try the speedy .204 against his “old reliable” .223. He came to favor the .204 for its accuracy, flat trajectory, and superior performance in the wind. Ken told us: “I love my .223, but the .204 has the edge for Dog-Town duty.”
The Cooper Montana Varminter in .204 Ruger
Story and photos by Ken Lunde
I’ve been a big fan of Cooper Arms rifles ever since my dad introduced them to me a few years ago. I prefer Cooper Arms rifles over others because they perform as they should out-of-the-box, and have outstanding workmanship and beauty. You get form and function. You don’t need to choose one over the other. For the price one pays, Cooper Arms rifles are a great bargain. I mount a quality scope, usually a higher-end Leupold with a 40mm objective, go through barrel break-in, and they always perform extraordinarily well. I should state that all of my rifle shooting is geared towards hunting. In other words, any shooting I do on paper is treated as preparation for using the same rifle for hunting, whether it’s for varmints such as prairie dogs, or for larger game.
Cooper Varmint Rifles–Components and Variations
The featured rifle is a Cooper Arms M21 Montana Varminter (aka “MTV”) chambered in .204 Ruger. It has a 24″ varmint-taper stainless steel barrel with a 1 in 12-inch twist. This twist rate seems to be typical of .204 Ruger barrels from other manufacturers. The stock is AA+ grade Claro Walnut, and has the varmint fore-end, “Buick” vents, and steel grip cap that are standard on the Montana Varminter configuration. Among Cooper’s three wood-stocked varmint rifle configurations — Varminter, Montana Varminter, and Varmint Extreme — I prefer the Montana Varminter as it seems to be the best balance of value versus features. Plus, I like the “Buick” vents. They’re very pleasing, at least to my eyes. Maybe that’s why I own seven of them, in M21 and M22 actions, and in a variety of calibers. [Editor: Ken’s father has a near-identical .204 Ruger Cooper, with consecutive serial number.]
For this rifle, I decided to mount a Leupold VX-III 6.5-20×40 LR scope with the Varmint Hunter reticle. The rifle came with Leupold STD bases in Matte finish, and I used Leupold 30mm STD rings in Medium height and Matte finish. I took the time to align the bottom rings on the bases, and properly lapped them. Other than mounting the scope, no custom work was done, because none was necessary. The trigger is superb out-of-the-box, which is typical of Cooper rifles.
Load Development and Accuracy I first tried factory ammo, loaded with Hornady 32gr and 40gr V-Max. The 32gr load shot the best — five-shot groups were slightly larger than a half-inch at 100 yards. My dad heard that Alliant Reloder 10X was a good powder for this cartridge, and he worked up a load using the Sierra 32gr BlitzKing bullet. He found that 26.5 grains was the right amount for his rifle. Considering that my rifle was probably made on the same day, having a consecutive serial number, I decided to try my Dad’s load, along with a half-grain up and down: 26, 26.5, and 27 grains of powder. I, too, found that my rifle prefers 26.5 grains of RL 10X. With this load, I could shoot consistent quarter-inch, five-shot groups at 100 yards. Cartridge OAL is 2.353″, or 1.990″ measured from the ogive.
I am using Winchester brass, Federal 205M primers, Alliant Reloder 10X powder, and Sierra 32gr BlitzKing bullets. I use Forster dies, and load with a Forster Co-Axial single-stage press. Here are two typical targets. As you can see, this .204 can shoot.
WARNING: Current lots of Reloder 10X powder may be somewhat different. 26.5 grains of RL 10X may be TOO HOT for your rifle and 32gr bullets. Seating depth, throat length, and COAL will affect pressures dramatically. START LOW at 24.5 grains and work up.
Cartridge Smack-Down — .204 Ruger vs. .223 Remington
Ken made these comments when he first tested his .204 Ruger vs. his trusty (and very accurate) .223 Remington: “I brought along two rifles. The first was my ‘proven’ varmint rifle, the one chambered in .223 Rem. It has stunning wood, and clearly escaped the factory with AAA grade Claro Walnut. That rifle also shoots consistent five-shot, quarter-inch groups at 100 yards. For the .223, my preferred load uses Winchester brass, Federal 205M primers, Hornady 40gr V-Max bullets (non-moly), and 26.2gr of Vihtavuori N133 powder.
I found that I very much enjoyed shooting the .204 Ruger rifle, which explains why I used only the .204 Ruger during the second trip, although I also brought along the .223. Why did I favor the .204? Well, those little 32gr bullets really zing out of the barrel, with a very flat trajectory, like a .22-250. And, to my surprise, they buck the wind very well, perhaps even better than .223. While I am no ballistics expert, I think that this may be due to its high velocity, clearly over 4,000 fps.
Related to the flat-shooting characteristics of the .204 Ruger cartridge, I found that I was able to depend on my Leupold’s Varmint Hunter reticle for both bullet drop and wind compensation. It was a very pleasing experience. For determining ranges in the field, I used a new set of optics for this trip, Leica’s new Geovid 8×42 BRF range finder.
Comparative Ballistics: .204 Ruger vs. .223 Remington vs. 22-250
Cartridge
Bullet
BC
Powder
Max Load
Muzzle Vel
400yd Drop
400yd 10mph Wind
.204 Ruger
32gr V-Max
.210
Benchmark
28.0
4047 fps
25.50″
17.88″
.204 Ruger
40gr V-Max
.275
H4895
27.7
3741 fps
26.93″
14.10″
.223 Rem
40gr Nosler BT
.221
Benchmark
27.3
3666 fps
30.67″
19.02″
.223 Rem
50gr Nosler BT
.238
BL-C(2)
28.0
3428 fps
34.21″
19.01″
22-250
40gr Nosler BT
.221
H4895
37.0
4060 fps
24.73″
16.67″
Load data from Hodgdon.com, for 24″ barrel. 2.250″ COAL .204s, Fed 205s. 2.210″ COAL for .223 Rem, Winch SR. 2.350″ COAL for 22-250, Winch LR. Always start 10% low and work up. Calculated at 1000′ altitude, 80° F.
This 2022 third-party video records the performance of .204 Ruger Hornady factory ammunition with both 32gr and 40gr V-Max bullets.
Dakota Dog-Town Adventures with Dad
Editor: When this story was originally written, Ken Lunde made two summer trips to South Dakota to hunt prairie dogs with his father. Here is his account of those summer-time adventures.
I drove to South Dakota twice [that year]. For the first trip, I brought two Coopers, both M21 MTVs, in .223 and .204 Ruger. My .223 Cooper was already proven during previous trips to South Dakota. I fired a total of 300 rounds, 200 from the .204 Ruger and 100 from the .223. I found the .204 Ruger to be flatter-shooting than .223, and it also seemed to buck the wind better, even with the light 32gr bullets.
For the second trip, I ended up shooting 301 rounds, all from the .204 Ruger rifle. I had discovered the importance of accuracy when hunting prairie dogs — and the .204 Ruger had exceptional accuracy. There are many variables with which to contend while shooting: wind speed, wind direction, variable distance to target, bullet drop, steadiness, and the accuracy of the load in the rifle. I find that the more of these variables I can control or compensate for, the greater the success.
I estimate I bagged about 250 prairie dogs during each trip, meaning about 500 in total for this season. There were misses, of course, but those are generally 400 yards and beyond, when wind becomes too much of a factor, or shooter error. And, for each trip, I managed to get two or three “doubles,” which is lingo that means that a single bullet results in two dead prairie dogs. Prairie dogs tend to congregate, and when they do, “doubles” become possible, and “triples” are not out of the question. One of these “doubles” was clearly visible through my scope.
The best part of these trips is spending quality time with my dad, doing something that both of enjoy: shooting and hunting. I grew up in Wisconsin, and my parents moved to South Dakota in December of 2004. South Dakota, and sometimes Wyoming, have come to be our preferred hunting states, because they’re superb hunting destinations. It is great that my parents have decided to settle in one of those states. In fact, the drive from California is not bad. It takes a little over one day. I also brought my teenage son along. He enjoyed the chance to go fishin’ with Grand-Dad, and one day “teen-angler” managed to catch us six fine trout.
My first trip to South Dakota, at the end of June, offered a unique oppor-tunity, since First Stop Guns was having a show that coincided with my time in the area. Dan Cooper, founder and owner of Cooper Arms, was present at the show. My dad and I decided to host a small dinner at my parents’ new home, and we invited Dan Cooper and others. I brought tenderloin steaks from California for this. In addition to Dan Cooper, Mark and Steve Blote of First Stop Guns, along with Paulette Kok of Dakota Arms, attended the dinner. It was a pleasure and honor to be in their company. They’re all very personable.
My father has a rather vast collection of Cooper Arms rifles, so I naturally invited Dan Cooper to check them out. A couple of them turned out to be special. One turned out to be the very first .22-250 rifle that Cooper Arms built. It is a Model 22 Varmint Extreme with ebony fore-end tip. Another is an Model 21 Classic with Schnabel fore-end, and according to Dan, less than 30 such rifles were ever crafted. It’s in the rack picture at left. Two of Dad’s rimfires are also very early Coopers, with two-digit serial numbers. They were made before Cooper started using the magazine insert supplied by Anschütz. And check out the middle rifle in the rack. It’s a Dakota Arms Model 97 Deluxe Hunter that I bought for Dad. He hand-picked the amazing wood blank, and it turned into an outstanding rifle stock. You can see how it stands out in the photo. Interestingly, the day before our dinner, I used Dad’s M21 with the Schnabel stock, chambered in .222, to hunt prairie dogs in the 9,000 acres of public hunting land bordering the eastern side of my Dad’s 56-acre “recreational” property, situated just north of Hot Springs, SD. Here’s a photo. Yes, I’d say this is a great place to hunt and “get away from it all”.
Spring Groundhog Hunting — Fun and Challenging
Springtime is the right time for groundhog hunting in the Northeast USA. Groundhog hunting is both fun and challenging. In today’s Saturday Showcase, we feature three videos showing successful groundhog hunts. Then there is a video about checking your equipment and verifying your varmint rifle zero.
We’ve even included a good video offering cooking tips for groundhog/woodchuck.* Yes groundhog meat can be quite savory — used in stews, sandwiches, or tacos. Last but not least we’ve included a section on groundhog shooting matches. These are fun matches with paper and/or steel groundhog targets.
Groundhog Hunt Report — Successful Stalk and Shoot
Here’s a great Realtree.com video showing successful groundhog hunts. This covers the process of spotting and tracking groundhogs on farmlands. Woodchucks are sensitive creatures that get easily spooked. This video shows that groundhog hunters need patience and skill, plus an accurate rifle.
Groundhog Hunting on the Family Farm with .17 HMR
In this video, the host employs his CZ 457 rifle chambered in .17 HMR to hunt groundhogs on his farm. The video provides a hunter’s POV with excellent Scope-Cam footage. This young shooter has 280 videos on his popular Blocketh Outdoors Channel including videos showing how to stalk groundhogs successfully. These critters go to ground quickly if they see or hear the hunter. NOTE: The lead photo for this Saturday Showcase comes from another Blocketh Outdoors groundhog video.
Groundhog Killshot Compilation Video
Here’s a classic “killshot” video showing multiple hits on groundhogs. If you want to see how a well-aimed varmint bullet can flip, spin, and elevate a groundhog, this video will keep you entertained. While we like explosive hits on prairie dogs, it may be better to use a solid, non-expanding bullet if you plan to harvest the groundhog (aka woodchuck) meat.
Groundhog Hunting — Importance of Confirming Your Zero
This AR15 Hunter channel video covers getting ready for spring groundhog season. This is a helpful video that shows how to confirm your zero on your varmint rifle. If you have an AR-platform Modern Sporting Rifle, this video is worth watching.
If you don’t have groundhogs in your part of the USA, don’t fret. You can still have fun hunting smaller varmints such as ground squirrels and Prairie Dogs. Here’s a good video covering P-dog hunts with a suppressed .223 Rem AR. The video covers recommended equipment including bipod, tripod, and optics.
Groundhog Matches — Fun Shooting at Paper and Steel ‘Hogs
Along with actual groundhog hunting, many shooters like to shoot paper and/or steel groundhogs in club groundhog competitions. These are fun matches that you can shoot with a variety of rifles. Our first choice would be a 22 BR for ranges out to 450 yards or a 6 BRA if targets are farther out. One popular match in the Northeast is the St. Thomas Ground hog shoot in Pennsylvania (see below).
At clubs across the country, varmint fun shoots (also known as “groundhog matches”) are becoming more popular every year. In these matches, usually shot from the bench, you engage paper targets, clay pigeons, steel “critter” silhouettes, or some combination of paper and reactive targets. Shooters like these matches because you can shoot a wide variety of rifles, you don’t have to spend a fortune to be competitive, and there is fun for the whole family. Rules are inclusive — you won’t be turned away because your rifle is two ounces overweight. A large percentage of the match fees usually go back to shooters in the form of cash prizes. And the level of camaraderie is high.
St. Thomas Groundhog Shoot, Report by Jonathan Trivette
Nestled at the base of a mountain in south-central Pennsylvania is the St. Thomas Sportsmen’s Association. On a cool Saturday morning you’ll find some of the area’s best shooters at the monthly Groundhog Match. The match attracts shooters from Virginia, Maryland, West Virginia, and of course Pennsylvania.
It may not be the longest-yardage match in the area, but it can be the one of the toughest. The range is sloped up the mountain a little so the winds can be very tricky. Often times the three wind flags at 200, 300, and 400 yards will all be blowing in different directions.
* “Groundhog” and “Woodchuck” are simply two different names for the same animal. Both terms have been used in the English language since the 1600s. In many places, the terms are used interchangeably, but “groundhog” is now increasingly more common in the USA.
Lapua and Berger, two leading companies with great products for competitive shooters and skilled hunters, will have multiple new and enhanced products on display at the 2026 NRA Annual Meetings & Exhibits in Houston, Texas, April 16-19, 2026. Lapua will showcase its new MaxRange Target Bullets and TRX polymer-tipped solid copper bullets and ammunition designed for long-range precision shooters and hunters. And Berger will display a variety of new bullets and hunting ammunition offerings.
New Lapua Products for 2026
New MaxRange™ Target Bullets
This year, Lapua is expanding its MaxRange™ Target bullet line, engineered for extreme‑precision shooters competing in today’s long‑range disciplines, including PRS, F‑Class, Fullbore, and other formats where targets extend beyond 1000 meters.
New additions to the MaxRange™ Target lineup include the 6.5mm 144gr MaxRange Target, offering an impressive 0.335 G7 ballistic coefficient, and the .30 caliber 175gr MaxRange Target, engineered to deliver outstanding long‑range performance while unlocking renewed precision potential for the .308 Winchester. These bullets will be on display at the Lapua Booth at the NRA Houston event.
New TRX™ Tipped Solid Copper Bullets & Ammunition
Lapua will also showcase its TRX™ polymer‑tipped, solid copper bullets, developed for hunters and precision shooters who demand superior exterior ballistics and reliable terminal performance. TRX bullets deliver industry‑leading long‑range precision, featuring some of the highest ballistic coefficient values in their class.
In addition to 6.5mm 120gr, .30 caliber 150gr, and .30 cal 165gr TRX projectiles, Lapua will offer factory‑loaded TRX ammunition in the following chamberings: 6.5 Creedmoor. 6.5×55 Swedish, .308 Winchester, .30‑06 Springfield, .300 Win Magnum.
Berger — New Products for 2026
Berger will showcase new precision bullets and ammunition at the 155th NRA Annual Meetings & Exhibits in Houston, TX this week. New offerings include 7mm PRC Elite Hunter ammunition, .22 caliber 69gr OTM bullets, 300 PRC 217 Grain Elite Hunter ammunition, and 1500-count Competition Packs designed for long-range accuracy and competition shooting.
New Berger Competition Bullet Packs
This year Berger will sell 1500‑count Competition bullet packs. This allows handloaders to secure large quantities of bullets from the same production lot. That helps assure load accuracy and consistency when loading hundreds of rounds for many matches. This helps PRS, Fullbore, F‑Class, NRL Hunter, ELR, and other disciplines maintain consistent accuracy at 1,000 yards and beyond. The following Competition Packs are available now at authorized Berger retailers:
6mm 105gr Hybrid Target
6mm 109gr Long Range Hybrid Target
.25 caliber 135gr Long Range Hybrid Target
6.5mm 140gr Hybrid Target
6.5mm 144gr Long Range Hybrid Target
7mm 180gr Hybrid Target
7mm 184gr F-Open Target
.30 caliber 200.20X Hybrid Target
New .22 caliber 69 Grain OTM Bullets and .223 Rem OTM Ammunition
Berger is releading new 69gr OTM bullets. These are optimized for AR-style rifles with a 1:9″ (or faster) twist used in 200- and 300-yard competition. Berger also introduces .223 Remington 69gr OTM ammunition, loaded with premium components, including Vihtavuori powder. This new OTM ammo should deliver great precision and reliability.
New 7mm PRC Elite Hunter Ammunition
Berger introduces new 7mm PRC Elite Hunter loads featuring heavy-for-caliber options that deliver exceptional external ballistics and long-range terminal performance. Available in 175-grain and 195-grain Elite Hunter offerings, both loads are optimized for modern, fast-twist rifles.
New 300 PRC 217 Grain Elite Hunter Ammunition
Berger’s new 217gr Elite Hunter 300 PRC ammunition offers a heavy-for-caliber solution that maximizes energy and terminal performance. Featuring an ultra-high 0.695 BC and increased sectional density, this ammunition delivers outstanding downrange accuracy and impact energy.
Is factory 6.5 Creedmoor ammunition good enough to win a PRS or NRL competition? The answer is a resounding “YES” if we’re talking about Berger ammunition. Produced with Berger match bullets and premium Lapua brass, this Berger 6.5 Creedmoor ammunition demonstrated excellent accuracy, impressive velocity, and very good ES/SD numbers. When tested at 1000 yards with an MPA-stocked PRS rig with Rem 700 action, this ammo showed just half-MOA of vertical, and produced a group that would have been a 50-1X in F-Class competition. That’s quite impressive for a PRS rig.
This ammo test was performed by our friend Erik Cortina from Texas. The reigning SW Nationals F-Open champion, Erik is a top F-Class competitor who also shoots tactical matches (for fun and glory). A couple seasons back, Erik built a new 6.5 Creedmoor with a Remington 700 action. Though this rifle sports a top-shelf MPA chassis and premium Kahles scope, Erik calls this his “budget build” because it has a plain Rem 700 factory action rather than the elite Borden actions he normally runs. Erik’s actions of choice are the Borden Mountaineer for PRS and Borden BRM-XD for F-Class.
Erik posted: “Shot my budget 6.5 Creedmoor … with Berger Bullets factory ammo. I shot five rounds over the chrono to get speed. I used BC info from the box and it all lined up properly. I adjusted my ECTuner to tune load and it took just 15 shots to get it shooting well. It’s simple with good components.”
This Berger factory ammo features Berger 130gr Hybrid OTM Tactical bullets. The Lapua 6.5 Creedmoor cases have a large rifle primer. You can see this ammo displays good velocity with Extreme Spread and Standard Deviation rivaling good hand-loads.
Cortina says the very accurate Brux barrel and razor-sharp 6-24x56mm Kahles scope help achieve this kind of outstanding performance at 1000 yards. Here are the key components for Erik’s latest PRS rig:
Barrel Tuner by Erik Cortina — Fits Behind Muzzle Brake
This rifle features a barrel tuner designed and crafted by Erik Cortina. You can the EC Barrel Tuner alone, or, as you can see, the EC Tuner can be fitted BEHIND a muzzle brake. Erik tells us: “The EC Tuner allowed me to tune the barrel to my ammo rather than tuning the ammo for barrel as is done when reloading. With the tuner, there is no need to try different brands of ammo as they can all be tuned to shoot as good as possible in my rifle.”
When you make a reloading mistake, you may need to “pull down” assembled ammo. The embedded UltimateReloader.com video demonstrates how to use the Hornady Cam-Lock bullet pulling system.
When Reloading Goes Bad — The Danger of Over-Charging
Our friend Gavin Gear of UltimateReloader.com was recently reloading some 9mm pistol ammo with his Hornady progressive press. As part of his reloading procedure, he visually checks the cases — and he noticed that the charges seemed high. Sure enough, his most recently-produced rounds were about two grains over spec. He diagnosed the issue: “I was using a powder measure without a baffle. What happened was, over the course of the loading session, things settled in, and the charge level increased.”
Not knowing just when his powder measure started delivering too much powder, Gavin decided, for safety’s sake, to pull down all the ammo he had just reloaded. Yes that’s time-consuming, but it’s better than the alternative — having a dangerous Kaboom while shooting. With fast-burning pistol powders, a two-grain over-charge could cause a blown case, damaged firearm, and/or serious injury.
Watch Cam-Lock Bullet Puller Used to Remove Bullets from Loaded Ammo:
Use of Bullet Puller starts 4:00 minutes into video.
Gavin says it is vitally important to perform safety checks during the reloading process: “You’ve got to do it — check every single round to make sure there IS powder, and that there’s not too MUCH powder. Double, Triple, Quadruple check your components… and your powder charges. You can’t be too careful.”
To pull down a loaded round, first place the cartridge in the shellholder on your press ram. Then raise the round up into the bullet puller device installed where a die would go. The Hornady Cam-lock bullet puller works by clamping the bullet in a collet when you flip down the red-coated lever. Then, with the case held by the rim in the shell-holder, the bullet exits the cartridge as the press ram is lowered. It takes time, but it’s pretty fool-proof once you get the hang of it. This entire process is illustrated in Gavin’s video, starting near the four-minute mark.
The Hornady Cam Lock Bullet Puller has four (4) key components: 1. Cam-Lock die body; 2. Cam-Lock lever; 3. Stem; and 4. Collet (Caliber-specific).
NOTE: In order to use this tool, you’ll need the appropriate collet for each diameter range of bullets you intend to pull. For example use collet #3 for 6mm, collect #6 for 7mm, and collet #7 for .308 Caliber.
RCBS Lock-Out Die
A good safety option for users with progressive presses is the RCBS Lock-Out Die. This has a charge detection rod that dips into each case after powder has dropped. You adjust the die to the proper charge height for your desired load. If the actual dispensed charge is too high or too low, the Lock-Out Die senses the problem and stops the press from advancing to the next case (it does this by preventing the ram/shellplate from fully elevating). We’ve used the Lock-out die with success for both pistol and rifle cartridges. It’s sensitive to about one-half grain with pistol powders.
This Lock-Out Die works with Hornady and Dillon progressives as well as with RCBS progressives. It does take up one die station on the press.
The new 18th Edition of the Cartridges of the World was released just last month (March 24, 2026) so it is very up to date. This massive 720-page reference contains illustrations and load data for over 1500 cartridge types. That makes it a unique, very valuable resource.
If you shoot a wide variety of cartridges, or are a cartridge collector, this book is a “must-have” resource. The latest 18th Edition includes many new cartridge types and 1500+ photos. The print version costs $37.71 at Amazon.com. Or you can get the print book from Amazon 3rd party sellers starting at $32.00 plus $3.99 shipping. The Kindle eBook version costs $21.99.
CLICK HERE for a large FREE Content Sample from the Kindle eBook version.
Updated 18th Edition with Feature Articles
The 18th Edition of Cartridges of the World includes cartridge specs, plus tech articles on Cartridge identification, SAAMI guidelines, wildcatting, and new cartridge design trends. Cartridges of the World, the most complete cartridge reference guide in print, includes a full-color section with feature articles on new 7mm Cartridges, PRC Cartridges, 9mm Cartrdige, and a special feature on Gun Safes.
View Free Book Sample Content
FREE STUFF for You: If you want to see what you are getting, there is a very large sample section of the 18th Edition available online with over 100 pages of content and dozens of photos and illustrations. To access all this FREE INFO, CLICK HERE, then look for the cover photo and click below the cover photos where it says “Read Sample”. It may take a few moments to fully load the sample pages. NOTE: This content is primarily from the Kindle digital 18th Edition.
Cartridges of the World 18th Ed. CHAPTERS:
Chapter 1: Current American Sporting Cartridges
Chapter 2: Obsolete American Rifle Cartridges
Chapter 3: Wildcat Cartridges
Chapter 4: Proprietary Cartridges
Chapter 5: Handgun Cartridges of the World
Chapter 6: Military Rifle Cartridges of the World
Chapter 7: British Sporting Rifle Cartridges
Chapter 8: European Sporting Rifle Cartridges
Chapter 9: American Rimfire Cartridges
Chapter 10: U.S. Military Ammunition 5.56 to 20mm
Chapter 11: Cartridge ID by Measurement
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.
Midsouth — RCBS Explorer Reloading Kit 2, $329.88
⏺️ » Great price for everything you need — press, powder measure, scale etc.
For folks getting started with hand-loading, a great basic package is the RCBS Explorer Reloading Kit 2. On sale for $329.88 at Midsouth, this RCBS Package features pretty much all you need to load rifle and pistol ammo: Reloader Special 5 single-stage press, Uniflow-III Powder Measure, 1500gr digital scale, hand priming tool, powder funnel, powder trickler, hex key set, deburring tool, loading block, and Case Slick spray lube. You even get a Speer Reloading Manual.
Palmetto SA — Bulk Ammunition Sale, Rimfire and Centerfire
⏺️ » Major savings on wide selection of rifle, pistol, and shotgun ammo
Here is a great opportunity to get quality ammo for your pistols, rifles, and shotguns. Head over to Palmetto SA for the current April Ammo Sale. There is a large variety of .223 Rem/5.56 NATO ammo, plus very affordable .38 SPL and 9mm ammo. Rimfire fans will find great deals on all popular types: .17 HMR, .22 LR, and .22 WMR. Along with the ammo types shown above, there are many other pistol cartridge types. Plus you’ll find a huge selection of 12ga and 20ga shotgun ammo starting at just $0.36/shell.
Are you curious about bullet stabilization? Do you understand why bullets can tumble or become unstable if the velocity gets too low or if the twist rate is inadequate. Here is an excellent video from Gunwerks that explains Bullet Stabilization.
This animated video starts by showing the design/shape differences between an older-style rifle bullet and a newer VLD-style bullet with higher BCs (Ballistic Coefficients). Generally speaking, the longer a bullet gets relative to diameter, the more RPM is required for stability. And to achieve that higher RPM you need more barrel twist and/or more RPM. The video illustrates where the Center of Gravity and the Center of Pressure are located. These are farther apart (in relative terms) for a VLD or Hybrid-style, long-nose bullet.
When the bullet is in flight there is an angle of attack. This is exaggerated in the animation for illustration purposes, but it is important to understand the the attack angle affect stability. The rotation rate (Revolutions Per Minute) is a function of bullet velocity as it leaves the muzzle and the twist rate of the barrel. Since long VLD-style bullets need more stability, the barrel twist rate needs to be higher than with shorter, fatter bullets. This is pretty much try for all calibers.
The importance of adequate barrel twist rates for bullet stabilization is further discussed in this next video featuring Bryan Litz of Applied Ballistics:
Bullet Stability and Twist Rates
In this video, Bryan Litz talks about bullet in-flight stability and how to calculate barrel twist-rate requirements for long-range bullets. Bryan explains that bullet stability (for conventional projectiles) is basically provided by the spinning of the bullet. But this spin rate is a function of BOTH the nominal twist rate of the barrel AND the velocity of the projectile. Thus, when shooting the same bullet, a very high-speed cartridge may work with a slower barrel twist rate than is required for a lower-speed (less powerful) cartridge. For match bullets, shot at ranges to 1000 yards and beyond, Bryan recommends a twist rate that offers good stability.
The Cartridge Comparison Guide is a remarkably comprehensive 340-page, spiral-bound book. Covering over 250 cartridges, the Second Edition of the Cartridge Comparison Guide is the product of many years of labor by Andrew Chamberlain, a Utah-based hunter. Andrew says his Guide “compares every factory available cartridge from the 17 calibers up to the 50 caliber cartridges”. (Sorry, most wildcat cartridges are not covered.) Chamberlain’s Guide also compiles cartridge data from major ammunition manufacturers such as Barnes, Federal, Hornady, Norma, Nosler, Remington, Sierra, Swift, Weatherby, and Winchester. It shows the optimal velocity achieved for each bullet weight and calculates bullet energy, recoil, and powder efficiency. Large color photos illustrate handgun and rifle cartridges.
The Cartridge Comparison Guide provides data for thousands of cartridge/bullet/velocity combos. Quick reference sheets and ballistics charts cover Trajectory, Velocity, and Energy out to 500 yards. The Cartridge Comparison Guide also offers a firearms lexicon, plus Appendices covering Cartridge Selection for Game Animals, Bullet Selection/Design, Bullet Expansion, and Wound Channel Characteristics.
New Content in Second Edition of Cartridge Comparison Guide
The Cartridge Comparison Guide (Second Edition) costs $39.99 plus shipping and tax. CLICK HERE to visit the Online Store where you can order the 340-page book. Here’s what’s new in the Second Edition:
Addition of Shotgun Ammunition (Both Slug and Shot loads).
Momentum Calculation for all Rifle, Shotgun and Handgun loads.
Integration of Shotgun Slug Ammunition with Center Fire Rifle Data Tables.
Factory Load Summary Added (Shows manufacturers and loads produced).
One factory load and one hand load for every bullet weight available in each cartridge.
Over 90 pages of additional ballistics content (roughly 35% more than in First Edition).
Great Resource for Hunters
One of Chamberlain’s main goals in creating the Cartridge Comparison Guide was to help hunters select the right cartridge for the job: “This started as a personal project to gather information on the more popular cartridges commonly used for hunting. I wanted to find the best all-around performing cartridge and rifle that a guy on a budget could shoot. I began comparing cartridge performance, versatility, bullet selection, powder efficiency, recoil generation vs. energy produced, standing ballistic data for different environments….”
Giant Cartridge Poster for Computer Wallpaper (1665×1080 pixels)
Here’s a great illustration of hundreds of cartridges and shotshell types. For dedicated reloaders, this would work great as desktop “wallpaper” for your computer. CLICK HERE for full-size image.
I first tried factory ammo, loaded with Hornady 32gr and 40gr V-Max. The 32gr load shot the best — five-shot groups were slightly larger than a half-inch at 100 yards. My dad heard that Alliant Reloder 10X was a good powder for this cartridge, and he worked up a load using the Sierra 32gr BlitzKing bullet. He found that 26.5 grains was the right amount for his rifle. Considering that my rifle was probably made on the same day, having a consecutive serial number, I decided to try my Dad’s load, along with a half-grain up and down: 26, 26.5, and 27 grains of powder. I, too, found that my rifle prefers 26.5 grains of RL 10X. With this load, I could shoot consistent quarter-inch, five-shot groups at 100 yards. Cartridge OAL is 2.353″, or 1.990″ measured from the ogive.
I estimate I bagged about 250 prairie dogs during each trip, meaning about 500 in total for this season. There were misses, of course, but those are generally 400 yards and beyond, when wind becomes too much of a factor, or shooter error. And, for each trip, I managed to get two or three “doubles,” which is lingo that means that a single bullet results in two dead prairie dogs. Prairie dogs tend to congregate, and when they do, “doubles” become possible, and “triples” are not out of the question. One of these “doubles” was clearly visible through my scope.
My first trip to South Dakota, at the end of June, offered a unique oppor-tunity, since First Stop Guns was having a show that coincided with my time in the area. Dan Cooper, founder and owner of Cooper Arms, was present at the show. My dad and I decided to host a small dinner at my parents’ new home, and we invited Dan Cooper and others. I brought tenderloin steaks from California for this. In addition to Dan Cooper, Mark and Steve Blote of First Stop Guns, along with Paulette Kok of Dakota Arms, attended the dinner. It was a pleasure and honor to be in their company. They’re all very personable.
Spring Groundhog Hunting — Fun and Challenging
Along with actual groundhog hunting, many shooters like to shoot paper and/or steel groundhogs in club groundhog competitions. These are fun matches that you can shoot with a variety of rifles. Our first choice would be a 22 BR for ranges out to 450 yards or a 6 BRA if targets are farther out. One popular match in the Northeast is the St. Thomas Ground hog shoot in Pennsylvania (see below).
Cortina says the very accurate Brux barrel and razor-sharp 6-24x56mm Kahles scope help achieve this kind of outstanding performance at 1000 yards. Here are the key components for Erik’s latest PRS rig:
RCBS Lock-Out Die
The 
