Do you enjoy plinking with rimfire rifles and shooting reactive targets with handguns? Champion has developed a series of fun targets that tilt, spin, hop, or roll when hit. Made from a “self-healing” rubber-like polymer, Champion’s DuraSeal Targets can be hit dozens of times before they need to be replaced. (If you shoot only rimfire, they might last 200 rounds or more.) Along with the varmint spinners, we like Champion’s weighted wobble targets. These are offered in both a bowling pin shape and a sphere on a post (photo right). When you hit these targets they rock back and forth and side to side. Weights in the round bottom then bring the target back to an upright position.
Weighing 80% less than metal targets. DuraSeal spinning targets are extremely reactive so you can see every time your shot impacts the target. DuraSeal self-sealing, hole-closing material lets bullets pass through with little damage to the target prolonging the life of the target. DuraSeal is constructed to absorb hundreds of rounds from rifles and handguns.
Champion also offers “bouncing balls” and a 3D Star targets that hop and roll when shot. These make good long-range tactical rifle targets. The lifespan is not that great with large heavy bullets, but one of the ball or star targets should survive many dozens of hits with a .223 Rem or 6mmBR. We do recommend sticking to .22 LR rimfire rounds for best target longevity.
One of the biggest combined vintage military, service rifle, High Power, and pistol matches of the year, the CMP’s Talladega 600 takes place next week at the Talladega Marksmanship Park in Alabama. The event has been designed to appeal to rifle and pistol enthusiasts alike, providing a wide variety of marksmanship opportunities for competitors from around the country. Informational clinics, including the GSM Master Instructor Course and a Rifle Marksmanship 101 (with M16 EIC Match), offer an educational experience for both new and advanced marksmen.
The Talladega 600 will include a wide variety of popular CMP Matches:
BENCHREST GARAND MATCH
RIFLE MARKSMANSHIP 101/M16 MATCH
PISTOL MARKSMANSHIP 101/M9 MATCH
GARAND/SPRINGFIELD/VINTAGE/MODMIL MATCH
CONGRESSIONAL 30
RIFLE EIC MATCH
4-MAN TEAM MATCH
CARBINE MATCH
RIMFIRE SPORTER BENCHREST MATCH
HIGH POWER DIXIE DOUBLE MATCH
VINTAGE SNIPER TEAM MATCH
RIMFIRE SPORTER MATCH
M1A MATCH
CMP MATCH PISTOL 2700
CMP AS-ISSUED 1911 PISTOL MATCH
MILITARY & POLICE PISTOL MATCH
CMP .22 RIMFIRE PISTOL EIC MATCH
EIC PISTOL MATCH
Additional events include versions of prestigious National Trophy Matches, such as the Congressional 30 (with the same Course of Fire as the President’s 100 Match) and the Dixie Double Highpower Match (mirrored off of the Hearst Doubles Match).
This video has interesting aerial drone footage of the Talladega Marksmanship Park
Two Benchrest matches will be held during the Talladega 600 — a Benchrest Garand Match and a new Rimfire Sporter Benchrest Match.
Pistol Matches Are Always Popular
Many participants enjoy the Talladega 600 because they can compete with pistols between rifle matches. More Guns = More Fun. The Talladega 600 includes .22 Rimfire EIC and Service Pistol EIC matches, along with As-Issued 1911 and Military & Police pistol matches.
Advanced Electronic Target Systems — So No Pit Duty Required
Kongsberg target systems are used at the Talladega Marksmanship Park. Each firing point of the 500-acre facility is equipped with a state-of-the-art KTS electronic target and scoring monitor. This speeds up relays and eliminates the need for competitors to do pit duty to pull and mark targets. Located beside the shooter on the firing line, each monitor allows the competitor to see his/her shot location and score immediately.
Be prepared to have your mind blown by Max Michel. This guy is FAST. In this video he puts 18 shots on three targets with two (2) reloads, in a total of 4.79 seconds. That’s right, drawing from holster, he sends 18 rounds in under five seconds, with two mag changes in the process. That works out to a rate of fire of 225 rounds per minute. Consider this — Max shoots faster than a 19th-century Gatling Gun (which had a rate of fire of roughly 200 rounds per minute). And Max is accurate as well as speedy — 16 of Max’s 18 shots were in the targets’ A-Zones, with the other two just barely outside.
Click Speaker Icon to hear sound (audio) — it’s even more impressive with sound!
At age 39, Max Michel is a legend within the world of competitive shooting. A four-time World Speed Shooting Champion, six-time USPSA National Champion, and three-time US National Steel Champion, Max is a dominant force in pistol shooting sports. Born and raised in New Orleans, Louisiana, Max began shooting when he was just five years old. In 1999 Max joined the USAMU’s Action Pistol Team and served in the U.S. Army for 10 years as an Army shooter and trainer. Today, Max is recognized worldwide as a top-tier athlete and instructor.
Back in 2015, the firearms collection of famed gun writer Elmer Keith went to auction. The Keith Estate auction drew interest from around the globe, and bidding was strong. When the dust settled, and all the individual lots were totaled, Keith’s remarkable collection sold to various bidders for $1,905,458!
High-priced highlights from the auction are shown below. NOTE: You can see more than 60 other Elmer Keith firearms, along with a list of final auction prices. The Guns & Ammo website has a detailed, illustrated report on the Elmer Keith auction with dozens of high-quality photos.
Elmer Keith was an American rancher, firearms enthusiast, and author. Keith was instrumental in the development of the first magnum revolver cartridge, the .357 Magnum, as well as the later .44 Magnum and .41 Magnum cartridges, credited by Roy G. Jinks as “the father of big bore handgunning.” These videos recount Keith’s personal history and his influence on the design of modern Magnum cartridges.
Lot 1038: Colonel Jim Corbett’s .450/.400 “Tiger Rifle” (Sold for $264,500.00)
Dangerous Game Rifles in Collection
The legendary “Corbett Tiger Rifle”, a Jeffery boxlock .450/400 was used by famed hunter Edward James “Jim” Corbett. This rifle was featured in Corbett’s book Man-Eaters of Kumaon. Two of the man-eating tigers Corbett hunted were believed to have killed over 800 humans in the Kumaon Hills of India.
Lot 1005: Colt SAA No. 5 .44 Special “The Last Word in Sixguns” (Sold for $80,500.00)
This famous revolver started as a Colt SAA, but then was heavily modified. The top strap of the frame was welded up into a flat-top target configuration, with an adjustable rear sight added. The hammer was modified with a Bisley-type target spur. The unique grip of the Number Five was created by marrying a modified Bisley backstrap to a Single Action Army trigger guard. His most famous pistol, Keith called this handgun “The last word in fine six-guns”.
This video showcases this rare Colt SAA revolver, as viewed at the auction:
Lot 1060: Pachmayar Custom Model 70 .375 H&H (Sold for $22,425.00)
This may be one of the most beautiful model 70 Winchesters ever created. Listed as “Pachmayar Custom M70 .375 H&H with Full Coverage Engraving and Exhibition Wood” this rifle sold for $22,425.00 at the Elmer Keith Estate Collection auction. Look at the figure in that wood! The detailed engraving on the action and barrel is fantastic, as is the checkering on the grip.
Lot 1041: Westley Richards Droplock .476 NE (Sold for $69,000.00)
Used by Elmer Keith on safari in Tanzania, this was Keith’s preferred Elephant Rifle.
Lot 1020: Smith & Wesson Triple Lock Target Revolvers. (Sold for $39,100.00)
This rare set belonged to Gerrit Forbes and Ed McGivern before being acquired by Elmer Keith.
Photos courtesy of James D. Julia Auctioneers, Fairfield, Maine.
Winter is coming soon. For many Americans that means indoor training if they want to maintain their shooting skills. Even if you can shoot outdoors all year long in your location, it makes sense for position shooters to work on their rifle holds. The Mantis systems help with that. These advanced smart devices record and plot the movement of your firearm as you aim and then break the shot. There are systems for both dry-fire and live-fire training, starting at $99.99. Considering the cost of bullets these days, and the difficulty of finding primers, it makes sense to increase your dry-fire training.
Mantis X2 for Dry-Fire, $99.99
Built for dry-fire use only, the Mantis X2 ($99.99) provides real-time, shot-by-shot feedback for both pistol and rifle users. You can track multiple training sessions with data-driven insights, and monitor your progress. This unit has earned high user reviews such as: “As a new gun owner the Mantis X is a game changer for me. I have not been able to get to the range during the lockdowns and being able to practice at home [is great].” And another: “Easy to install[.] The App is free and easy to use.”
The Mantis X2 is a good value. The manufacturer states: “There is nothing at this price point that will give you this level of feedback for dry fire.” There are actually four Mantis models: X2 ($99.99), X3 ($169.99), X7 Shotgun ($199.99) and X10 Elite ($249.99). The X3 adds live fire functionality. MORE INFO HERE.
Mantis X10 Elite– Advanced Training System
The advanced Mantis X10 Elite ($249.99) is 50% lighter and 40% smaller than the original Mantis, with three times the battery life and four times the data transfer rate. This new quick-detach X10 system offers all X2 and X3 functions PLUS recoil analysis and software support for all shooting sports (pistol, rifle, shotgun, archery). Collecting thousands of data points per second, the X10 works with dry fire, live fire, airsoft/CO2, and simulated firearm systems.
Mantis Blackbeard Trigger Reset System for AR-Platform Rifles
If you compete with an AR-platform rifle, you can definitely benefit from the Mantis Blackbeard system, a drop-in Bolt Carrier + Magazine replacement that works with your existing trigger. Using electromechanical wizardry, the $199.00 Blackbeard quickly resets the hammer between each shot, so you can stay in position through multiple practice shots. Installation takes less than a minute — remove the bolt carrier group, drop in the red upper unit, place the red Mantis magazine and you’re good to go. All Blackbeards now support both direct impingement and piston-driven ARs. Guys we know say that a few sessions with this system delivered marked improvement in their service rifle scores.
Mantis X3 for Live-Fire or Dry-Fire, Rifle and Pistol
The Mantis X3 collects thousands of data points per second and analyzes your shooting in real-time. For both pistols and rifles, the X3 works with dry fire and live fire. It will also work with airsoft/CO2/compressed air, and simulated firearm systems. Priced at $169.99, the Mantis X3 mounts to standard universal accessory rails. (No Picatinny rail? Creedmoor Sports sells adapters). The X3 is part of the second generation of Mantis Shooting Performance Systems.
In the face of growing online censorship across many popular social media sites (such as YouTube), Brownells has launched a new online resource to help customers build their own AR-15 rifles at home. Hosted at Brownells.com/HowToBuild, the new web page features step-by-step, interactive videos. Featuring Brownells Gun Tech Caleb Savant, the videos show the AR-15 build process with easy-to-follow directions and expert advice. There are currently four AR Build videos: Introduction, How to Build Your Lower, How to Build Your Upper, and Troubleshooting Guide. See all videos at: Brownells.com/HowToBuild.
Each of the videos have an easy search button on the upper left-hand corner, allowing viewers to navigate to specific parts of the video. This will help viewers access key parts of each video and find the information they need. For example, the Lower Video has specific sections on trigger and buttstock installation. There is also a video on how to properly test fire and troubleshoot an AR-15 once it’s built.
In addition to the instructional videos, Brownells’ AR Builder Site also provides links to all the parts, tools, and accessories required to build an AR-15 rifle. There are specific links to uppers, lowers, triggers, grips, buttstocks, bolt carrier groups, handguards, barrels, gas blocks, muzzle brakes and more.
“Several social media platforms have banned videos and other content showing how to build firearms,” said Brownells V.P. of Marketing Ryan Repp. “Because of Brownells’ long-time support of the Second Amendment and individual freedom, it made sense for us to create a professionally-produced video and resource center to assist rifle builders of all skill levels make the rifle of their dreams in the comfort of their own home or workshop.”
Let’s face it, AR-platform rifles run dirty, at least compared to typical bolt-action rifles. The AR-15 works by piping gas from the barrel back into the bolt carrier, causing the bolt to unlock and the carrier to move the bolt backward. The “exhaust gas” from the barrel contains soot and carbon. The carbon will form hard deposits on the bolt. In addition, the carbon can combine with lube on the bolt carrier to make a nasty, paste-like sludge. This can be particularly problematic when the black paste pollutes the ejector and extractor recess.
This Editor has inspected dozens of ARs over the years. Other than mag-related malfunctions, the most common cause of AR cycling problems I found was oily gunk in the extractor and ejector areas. Many AR owners overlook these critical areas. Look at an AR that hasn’t been cleaned properly and you’ll probably find black gunk (and small brass shavings) in the ejector and extractor recesses.
If you want to keep your black rifle running smoothly and reliably, you must clean it regularly and follow the correct maintenance procedures. Here are three videos that explain how to properly disassemble and clean AR-platform rifles. And then they cover the essential lubrication ARs need to run reliably.
Take-Down and Full Cleaning of AR15 by Jerry Miculek
Here ace shooter Jerry Miculek takes down and cleans an AR-platform rifle belonging to his daughter Lena. This is a good video because Lena’s rifle was “run hard and packed up dirty” so you can see where carbon and grease build up. This 35-minute video is very thorough. Jerry is one of the nation’s top action carbine shooters, so listen carefully to his advice on cleaning and lubrication.
General AR-15 Maintenance and Lubrication
There are various schools of thought on AR lubrication. Some guys like to run “wet” with lots of CLP, while others choose to focus lubrication on the key spots that receive the most friction and wear, such as the contact point for the bolt carrier. We do advice check the ejector recess and extractor spring recess frequently as gunk can get in there, causing malfunctions. Here is a good video from Pew Pew Tactical — a 7-minute guide to cleaning and lubricating AR-platform rifles. This shows important details for both the upper and the lower.
How to Clean Your AR-15 Bolt Carrier Assembly
This video offers very specific advice on the bolt carrier group, which receives the dirty gas directly from the barrel. Be sure to check the extractor and ejector recesses. That’s where old lube, brass shavings, and carbon accumulate. Follow the directions in this video for lubrication, and don’t over-lubricate the bolt carrier — that will only capture more carbon.
With over 240 shooting-related videos, the Alabama Arsenal YouTube Channel is a remarkable resource. This video channel provides detailed field tests of tactical-type rifles, ARs, and pistols. The testers have access to some very impressive ranges, and many of the tests are far more thorough than you’ll typically find with most gun magazines and gun-centric YouTube channels. For example, Alabama Arsenal has a series of 1000+ round pistol test videos. These are well worth watching if you are considering purchase of a defensive handgun.
Today we showcase three rifle videos, two centerfires, and the CZ 457 .22 LR in two styles. After these rifle videos, you’ll find two very interesting technical videos regarding suppressors. The first tech video shows how to install suppressors, while the second video explores how suppressors can affect muzzle velocity.
Barrett MRAD .300 PRC at 2200 Yards — Extreme Long Range
Here’s a rugged tactical rifle put to the test at Extreme Long Range. This video, featuring a Barrett MRAD chambered for the .300 PRC cartridges, features accuracy testing out to 2200 yards (1.25 miles). There is some good drone footage covering the long path to the target. The shooter noted that the bullets fired from his .300 PRC “go sub-sonic somewhere between 1800 and 1900 yards”, creating additional ballistics challenges at this yardage.
Savage 110 Elite Precision for PRS Production Class
In this video AA’s team reviews the Savage Elite Precision Rifle with MDT ACC Chassis. Retailing for about $1750.00, this is one of the better production class options for PRS and NRL competition. Guns America Digest did a full review of this rifle, and was quite impressed.
CZ 457 Varmint Precision Trainer and Chassis
In this video, Alabama Arsenal compares two versions of the popular CZ 457 rimfire rifle, a great choice for the NRL22 tactical game. The test compares the CZ 457 in a Manners composite stock with a CZ 457 version in a Varmint Precision aluminum chassis. Right now basic CZ 457 rifles start at about $400.00, with the Varmint Precision Chassis models running $845-$900.
Informational Videos about Rifle and Pistol Suppressors
Alabama Arsenal regularly tests its firearms with suppressors. Over the course of time, the testing team has leaned much about modern sound moderators, comparing features and learning how to install and maintain quality suppressors. These two videos offer valuable information on suppressors.
Silencer School Pt. 3 — Mounting Basics
Field Testing — Do Suppressors Change Bullet Velocity
Want to see more content like this? Here are LINKS…
Alabama Arsenal has 240+ videos on its YouTube channel. In addition, you’ll find dozens of firearms photos and other shooting-related content on Alabama Arsenal’s social media pages: Facebook; Instagram; and Twitter. You can support the Arsenal’s gun testing by subscribing to the Alabama Arsenal’s PATREON Page.
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.
1. KYGUNCO — Savage Axis II Precision Rifle, $699.99
⏺ Good entry-level PRS rifle that also works for hunting
The Savage Axis II, on sale for $699.99 at KYGUNCO in 6.5 Creedmoor or .308 Win, offers good performance for the price. It can serve as a competent starter rig for PRS/NRL competition, and also function well for hunting, with a weight of 9.9 lbs without scope. The Savage Axis II combines an accurate barreled action with a nice MDT chassis with adjustable comb and adjustable length-of-pull. For more info, read the very thorough Savage Axis II review in Guns America Digest.
2. Scopelist (EuroOptic) — Nightforce Clearance SALE
⏺ Save HUNDREDS on Nightforce ATACR and other NF optics
Right now ScopeList (a EuroOptic.com partner) is running a big Nightforce Clearance Sale. You can save up to $515 dollars on demo Nightforce optics with full factory warranty. Chose from the popular ATACR series or the advanced NX8 model with MOA or MilRad clicks. There are a variety of good FFP and SFP Nightforce optics on sale now.
3. Bass Pro — Garmin GPSMAP 64SX, $219.99
⏺ $130 Savings on full-featured modern GPS with TopoActive Maps
This rugged handheld Garmin GPSMAP boasts reliable satellite connectivity with Altimeter and Compass features. This 64SX model also comes pre-loaded with TopoActive Maps, which are great for backcountry hunters. This water-resistant design features button operation with a sun-readable 2.6″ screen.
4. Midsouth — SIG Sauer Optics Sale
⏺ SIGnificant savings on BDX scopes, BDX rangefinders, and red dot optics
SIG Sauer makes excellent products with notable features. SIG BDX Laser Rangefinders can communicate (via Bluetooth) to BDX series scopes. This allows calculated hold-over points to appear in the scope reticle. In addition, the LRF communicates with Ballistics Apps on your mobile device. Right now Midsouth has SIG Sauer optics products on SALE including scopes, rangefinders, Red Dots, and binoculars. Along with BDX scopes, SIG’s Whiskey5 SFP scopes are on sale. Many items also qualify for FREE Shipping.
5. Palmetto SA — AR15 Complete Stealth Lower (Blem), $139.99
⏺ GREAT deal on complete lower with full trigger group and adjustable stock
With changes to Federal law looming on the horizon, it may be wise to get your Black Rifle now. Here is a great deal on a complete lower with stock. The PSA AR-15 MOE Stealth Lowers include full, installed trigger group, plus a nice, adjustable MagPul MOE buttstock. The price is just $139.99 because these “blem” lowers may have a small scratch or blemish somewhere. For the same $139.99 bargain price, chose the Black Stealth Lower or the Flat Dark Earth Model as shown above.
6. MidwayUSA — Hoppes Gun Vise and Cleaning Kit, $39.99
⏺ Good basic gun vise at great price with bonus cleaning kit
The Hoppe’s Gun Vise is a good basic support for working on your firearms. Clamping brackets in the front and rear hold your rifle or shotgun securely without scratching. The vise is made out of a durable, chemical resistant polymer and has multiple compartments for your cleaning chemicals, tools, and accessories. Included with this vise is a 12-piece Cleaning Kit for rifles, pistols, and shotguns. Features include: Dual lockable no-scratch brackets, multiple compartments for tools, and adjustable feet.
7. Natchez — Bushnell Optics Sale, Save 35%
⏺ Great prices on hunting scopes and Red Dot optics
Hunting season is in full swing. If you need an affordable optic for your hunting rifle, check out the Bushnell Optics Sale at Natchez. A variety of scopes are 35% off. In addition, there are great prices on Red Dots you can use on a shotgun, pistol, or tactical rifle. And prices have been slashed on Bushnell binoculars and spotting scopes as well. Act soon — these Natchez sales don’t last long.
8. Midsouth — Forster Accu-Ring, $14.99
The new Forster Accu-Ring has precise markings so you can set your sizing dies with extreme precision in your press. The anodized ring has laser-etched precision markings in .001″ increments. This allows you to more easily set the amount of sizing and shoulder “bump” you get when you move a die up or down in your press. In addition, if you have a conventional seating die without a micrometer adjustment, this new Forster Accu-Ring can help you achieve more precise bullet seating. SEE Ultimate Reloader Review.
⏺ Owners say it is sharp with good features for price
This Sawback Bowie spring-assisted folding knife, just $9.70 on Amazon, has a 3.5″ blade. There is a curved cutting edge with a serrated section near the handle. Actual purchasers state: “This knife is very well made with a tight feel. No play at all. The assisted open is excellent [and] they come very sharp too”, and “This is a good quality knife. It’s solid and a bit heavy, really good looking and comes pretty sharp. Overall its a great knife.”
⏺ Quality name-brand shooting eyewear — buy multiples at this price
Every shooter needs eye protection EVERY TIME you go to the shooting range. Right now Midsouth has the good Radians clear Lens Outback Shooting Glasses for just $5.88. These ANSI Z87.1 Radians Shooting Glasses provide 99.9% UVA/UVB protection with the coated lenses. These offer excellent wrap-around protection and are fairly light and comfortable. A handy neck cord is included. With this low $5.88 price, you can buy 3 or 4 sets and keep spares for yourself and your shooting buddies.
One of the most important aspects of precision reloading is setting the shoulder bump during the full-length (FL) sizing process. You want the amount of “bump” to be precise and identical for every loaded round. However, when you switch brands of brass you may need to change the die position to get the desired bump and case body sizing. And even with the same brand of brass, you may find that you need to adjust your FL die as the number of brass load cycles increases. Brass that has been fired many times will behave differently than new or near-new brass.
Also, even with the same cartridge type, brass loaded for a semi-auto rifle may need more bump than brass fired in a bolt gun. For example, with .223 Rem ammo, you’ll normally want to push the shoulder back farther if the ammo will be shot in a AR15 as opposed to a bolt-action rig.
So how do you make all these needed adjustments for your full-length dies? You can move a conventional locking ring up and down, but that can be a tedious, trial-and-error process. Some guys use shims in one-thousandth intervals, but that still requires taking your dies in and out of the press. Well there is a better way now…
PMA Tool Micro-Die Adjuster
Wouldn’t it be great if you could precisely adjust your FL die up and down in half-thousandth increments, with a simple indexed click. That is now possible with products offered by PMA Tool and Whidden Gunworks. PMA Tool offers a Micro-Die Adjuster that replaces your existing lock ring and can be used with nearly any 7/8-14 full length sizing die. The engraved marks correspond to approximately .001″ of shoulder bump adjustment. Splitting the engraved marks is therefore approximately equal to .0005″ (half a thousandth). Users love this product, saying it adds precision and saves time.
Whidden Click-Adjustable FL Sizing Die System
Whidden Gunworks offers a complete click-adjustable FL sizer die with a special, indexed ring. With Whidden’s patented Click Adjustable Sizer Die system, the die and lock ring work together to allow rapid, precise bump adjustments. One click changes the bump .001″. It’s simple and fast. Included with the Click Adjustable Sizer Die is a shoulder bump gauge. John Whidden explains:
“There has become a need for an easier way to adjust the sizer die properly. Until now there have been few options other than trial and error to get the shoulder setback correct. Anyone who has done this can attest that it’s a slow and imprecise job! Our die and lock ring work together to give the user a clicking feel to the adjustment. Each click moves the shoulder bump .001” so you can easily find the exact shoulder bump that you desire.” — John Whidden
New Universal Click Adjustable Lock Ring for Standard Sizing Dies
Whidden Gunworks also now offers a Universal Click Adjustable Lock Ring for all brands of standard sizing dies. If you don’t need a complete die, this special Lock Ring provides the functionality of the Whidden click-adjustable sizing dies for the standard 7/8-14 dies you already own. Lock Ring Instructions PDF.
John Whidden explains: “With our Universal Click Adjustable Lock Ring (Patent No: 10,393,488) you can instantly turn your sizer die into a Click Adjustable Die. Our ring works with any 7/8 OD sizer of any brand with adjustable shoulder bump. The inner and outer ring can rotate independently of each other. Each click is metered in true 1 thousandths adjustment and has .100″ total available travel. Those loading for two rifles with different headspace can easily optimize the shoulder bump for each rifle.”