Here are the main tools you’ll need to assemble an AR-platform rifle
In these challenging times, many Americans are buying an AR-type rifle, or starting an AR project — assembling the rifle from available uppers, lowers, and parts kits.
If you are planning to put together an AR-platform rifle or upgrade your AR with a new barrel, stock, or trigger group, here’s a tip. Check out the AR-15 Rifle Build DVD from our friends at UltimateReloader.com. This DVD covers all the details of a custom build, using high-resolution video sequences, and helpful supporting graphics.
In this DVD, Gavin Gear guides you through the entire process including selecting components, acquiring and using the necessary tools, assembly steps and details for each component, and even mounting a scope. Building an AR-15 can be overwhelming, but with the right guidance and help it’s not difficult and can be very rewarding. With this DVD you’ll be able to build your AR-15 with confidence.
Upper: Barrel / Gas Block / Gas Tube
Upper: Handguard Installation
UltimateReloader.com’s AR-15 Build DVD is available just $9.90 (plus $3.80 shipping/handling). This DVD can pay for itself many times over by showing you how to do your own gunsmithing (and get quality AR components at attractive prices).
Click image to view PDF with all state information.
Government officials across the nation have issued numerous orders in an effort to contain Covid-19 infections. The National Shooting Sports Foundation (NSSF) has collected the latest health-related official Executive Orders from U.S. States that can affect FFLs, firearms business owners, range operators, and gun owners. These rules are collected in a lengthy NSSF document, with state-by-state summaries plus web-links for further details. This document will be updated as new info is received from the states. Click the link below to download the State-by-State COVID-19 Information and Resources for FFLs:
The NSSF states: “On the state front, our team is working in each state and many localities to ensure our industry and the critical role it plays is not hampered by well-intended Executive Orders seeking to stem the spread of the virus. Here is a list of the orders we are actively tracking, and what they mean for our members. Please note this is a rapidly changing list, and that many of the orders are subject to interpretation. MORE INFO HERE.
Ammoland.com explains: “The list is broken down by state and gives shooters a brief rundown on each order. This includes a link to the original order itself, the order or bill’s name, and a brief summary of what it does. Shooters worried about their state, in particular, might want to download any PDF files associated with their location for safekeeping should the Government decide to delete them later.”
There’s a very good episode of Gun Talk Radio slated today. Gun restoration expert Doug Turnbull will answer questions on restoring old guns, the team looks at the upcoming Presidential election, and Tom talks with the author of a new concealed carry manual. Tune in for all this today on Gun Talk, the original nationally-syndicated radio talk show about guns and the shooting sports.
This week, Tom interviews gun restoration expert Doug Turnbull (Turnbull Restoration). Call in with your questions about that old gun you own. Then gun rights attorney Emily Taylor comments on what a Biden presidency might look like and Tom also talks to Jerry Wayne, the Michigan union member who confronted Joe Biden about the Second Amendment. Lastly Tom Given talks about his new book Concealed Carry Class–The ABCs of Self-Defense Tools and Tactics.
This broadcast airs Sunday March 22, 2020 from 2:00 PM to 5:00 PM Eastern time on radio stations nationwide. Past podcasts can be heard online via the GUNTALK PODCAST Site and Apple iTunes. The Gun Talk podcast archive has many great shows. Click the link below to hear a recent show (3/15/2020) about the challenges of buying guns and ammo during the current crisis caused by the Coronovirus. In California, for example, the Governor has ordered the closure of gun stores, and state law blocks mail-order ammo sales.
Gun Talk Coronavirus Podcast from 3/15/2020:
As always, call 866-TALK-GUN with your comments, questions, and range reports.
Tom Gresham’s Gun Talk Radio show airs live on Sundays from 2PM-5PM Eastern, and runs on more than 270 stations. Listen on a radio station near you or via LIVE Streaming. All Gun Talk shows can also be downloaded as podcasts at http://bit.ly/GTRpodcast, Apple iTunes, or through the Gundelio Apps. Gun Talk is also available on YouTube, Roku, Apple TV, Amazon Fire TV, and GunTalk.com.
The question of barrel break-in is controversial. Some folks advocate an elaborate, lengthy cycle of shooting and brushing, repeated many times — one shot and clean, two shots and clean and so on. This, it is argued, helps barrels foul less and shoot more accurately. Others say minimal break-in, with patching and brushing after 10-15 rounds, is all you need. Still others contend that break-in procedures are a total waste of time and ammo — you should just load and shoot, and clean as you would normally.
We doubt if there will ever be real agreement among shooters concerning barrel break-in procedures. And one must remember that the appropriate break-in procedure might be quite different for a factory barrel vs. a custom hand-lapped barrel. This Editor has found that his very best custom barrels shot great right from the start, with no special break-in, other than wet patches at 5, 10, and 15 rounds. That said, I’ve seen some factory barrels that seemed to benefit from more elaborate break-in rituals.
What’s the best barrel break-in procedure? Well our friend Eric Mayer of Varminter.com decided to ask the experts. A while back Eric interviewed representatives of three leading barrel manufacturers: Krieger, Lothar-Walther, and Shilen. He recorded their responses on video. In order of appearance in the video, the three experts are:
Do I Need to Break-In a New Rifle Barrel?
Eric Mayer of Varminter.com says: “That is a simple question, [but it] does not necessarily have a simple answer. Instead of me repeating my own beliefs, and practices, on breaking-in a new rifle barrel, I decided to answer this one a bit differently. While we were at the 2016 SHOT Show, we tracked down three of the biggest, and most popular, custom barrel makers in the world, and asked them what they recommend to anyone buying their barrels, and why they recommend those procedures. We asked the question, and let the camera run!” Launch the video above to hear the answers — some of which may surprise you.
Long-Term Barrel Care — More Experts Offer Opinions
Apart from the debate about barrel break-in, there is the bigger question of how should you clean and maintain a barrel during its useful life. Some folks like aggressive brushing, other shooters have had success with less invasive methods, using bore foam and wet patches for the most part. Different strokes for different folks, as they say. In reality, there may not be one solution for every barrel. Different fouling problems demand different solutions. For example, solvents that work well for copper may not be the best for hard carbon (and vice-versa).
“Why worry about a little barrel fouling when the throat is subjected to a brutal 5,600° F volcano at 55,000 PSI? To investigate these and other questions about taking care of a match barrel, we spoke with a dozen experts and share their knowledge in this first of a series of articles.
After listening to folks who shoot, build barrels or manufacture cleaning solvents for a living, we concluded that even the experts each have their own unique recommendations on how to care for a match barrel. But they all agree on one thing — the gun will tell you what it likes best. Because the life expectancy of a match barrel is about 1,500 to 2,500 rounds, the objectives of cleaning one should include: preserve accuracy, slow the erosion, and remove fouling — all without damaging the gun. This article doesn’t claim that one cleaning method is better than the next. Rather, we set out to interject a little science into the discussion and to share some lessons learned from experts in the field.” — Chip Lohman
This story, from our Gun of the Week Archives, offers a good intro to the 30 BR cartridge, which is still the leading chambering for short-range Score Benchrest.
What’s better than one custom-built 30 BR with gorgeous wood and top-shelf components? A matching pair of course. Just ask Australian shooter Greg Roche (“Caduceus” in our Forum). A decade ago, Greg spent two years living and working in the USA. While in America, he commissioned two matched custom rifles to bring back to Australia for Hunter Class BR matches. Though the look-alike rigs are both chambered in 30 BR, one is designed for the Australian “Traditional” centerfire Hunter Class (10-lb limit), while the other is purpose-built for the “Custom” centerfire Hunter Class (14-lb limit). The 10-lb Traditional rifle features a fully-functioning two-round magazine and a 6-power scope. In contrast the Custom Class rifle is a single-shot action, with a 45X Leupold scope. The Custom weighs 13.5 pounds so it can also be used in traditional Heavy Varmint Benchrest matches if desired.
Tale of Two Rifles Story and Photos by Greg Roche (“Caduceus”)
The USA boasts some of the finest precision rifle-builders and Benchrest parts suppliers in the world. Before returning to Australia after two years in the States, I decided to have two special BR rifles built using American components and skilled labor. I wanted a matched pair — twin guns that would be as handsome as they were accurate. The heavier gun of the pair, the 13.5-lb Custom Class rifle, features top-of-the-line (but well-proven) technologies and components. With the 10.5-lb Traditional Class rifle, we had to develop new solutions to allow the 30 BR cartridge to feed from a functional two-round magazine. Here is my saga of how my twin 30 BRs were conceived and built, and how they have performed in competition.
BACKGROUND — The 30 BR for Score Competition
The 30 BR is a wildcat cartridge based on a necked-up version of the 6mmBR Norma case. It originated in U.S. Benchrest circles where it found its niche in Varmint For Score (VFS) matches. Unlike traditional Benchrest, where group size determines the winner, VFS matches are shot on a target with multiple, concentric-ringed bullseyes. Point total is based on “best edge” shot location (one shot per bull). In score competition, the 30 BR’s “supersized” .308-diameter hole offers an advantage over the 6mm hole created by a 6 PPC, the dominant group BR chambering.
The starting point for loading the 30 BR wildcat is Lapua 6mmBR brass. These are necked up as a single-step operation using a .30 caliber tapered expander ball (or dedicated expander mandrel). This will leave a bulge in the neck, so the expanded case neck is normally turned to bring the thickness down to the correct dimension for the chamber. I turned these necks down to .010″ wall thickness using a Stiller neck-turning tool. It features an eccentric mandrel similar to the Nielson “Pumpkin”. Loaded rounds measure .328″ neck diameter. This gives minimum clearance in my .330″ neck chamber, so very little neck resizing is needed after firing. Cases are trimmed to 1.500″ prior to turning to ensure consistency since the Stiller tool indexes the length of cut off the case mouth. Other than that, cases are just chamfered, loaded and made ready to shoot. No special fire-forming is required.
17-Twist Barrels for Both Rifles
Texan gunsmith Mike Bryant chambered both barrels. Mike also polished both barrels to a high-gloss to match the receivers. In this game, barrels are consumables, much like powder and primers, so most owners wouldn’t bother to polish their barrels. However a 30 BR barrel can provide up to 5000 rounds of accurate life (unlike a 6PPC barrel which might be tossed after 800-1000 rounds.) So, these barrels are likely to be on the rifles for many seasons. Given the high-gloss finish of the Grizzly actions and the beauty of the Red Cedar stocks, it would have been an injustice to leave a dull finish on the barrels.
The chambers were both cut with the same reamer supplied by Dave Kiff of Pacific Tool and Gauge. Randy Robinett, one of the originators of the 30 BR wildcat, specified the reamer dimensions. Randy’s 118gr, 10-ogive custom BIB bullets and the 30 BR cartridge enjoy a winning track record in the USA. The 30 BR Robinette reamer has zero free-bore and a .330″ neck, and is optimized for the BIB 118s. The bullets perform best when seated far enough out to jam firmly into the rifling as the bolt is closed. The long ogive means the bullet’s bearing surface is very short.
Slow Twists for Maximum Accuracy
You may note the unusually slow twist rate of both barrels. In most .30-caliber chamberings, the barrel twist rate is 1:11 or 1:12 to stabilize 150gr to 200gr bullets. The 30 BR is optimized for 115gr to 118gr flat-base bullets and 1:17 provides sufficient stability at muzzle velocities around 2900-3000 fps. In competitive Benchrest, where every thousandth of an inch counts, over-stabilization of projectiles can hurt accuracy, so “just stable enough” is the goal; hence the 1:17 twist.
Case Forming, Case Prep, and Reloading Methods
A Sinclair case neck micrometer indicates neck thickness of 0.010″ after neck turning.
30 BR dies are readily available from a number of manufacturers. I personally use Wilson neck and seating dies with a Sinclair Arbor press, but Redding and Forster both supply high-quality threaded dies for use in a conventional press. For under $100.00 US, custom full-length dies can be obtained from Hornady and CH Tool & Die by sending them reamer prints or a couple of fired cases. Harrell’s Precision offers “semi-custom” dies. Just send them some fired cases and they select a pre-made CNC-cut die that ideally fits your chamber. You can ask the Harrell brothers for a die that’s tighter at the shoulder or base, or otherwise customized to your preferences.
Load Development and Accuracy Testing
With cases formed and bullets selected, load development is simply a matter of choosing the right primer, powder and charge weight, and loading the most consistent ammunition possible. The Lapua BR cases use a small rifle primer. The choice here was Federal 205 Match primers vs. CCI BR4 Benchrest primers. Some shooters have also had success using CCI 450 Magnum primers but it is very unlikely the small case needs this much spark to light off regular extruded powders. In my case, I selected Federal primers because availability tends to be better in Australia.
The relatively large bore-to-capacity ratio of the 30 BR case means that fast burning powders are the order of the day. Once again, US experience suggests H4198 (the Hodgdon equivalent of ADI AR2207) is the choice of match winners. The fact that H4198/AR2207 is an Australian-made product is an added bonus. So, I loaded up test rounds with AR2207 from 32.5 grains to 35.0 grains in approximately 0.3 grain increments. All bullets were seated to jam +0.010″ into the lands. This places the bullet base about two-thirds of the way down the neck and well short of the neck-shoulder junction.
Need a new barrel for your Rem-actioned hunting or tactical rifle? Here’s a great DIY option for riflemen. McRee’s Precision offers complete, no-gunsmithing re-barreling kits for Remington and Rem-clone actions. These feature a high-quality, pre-chambered “PRE-FIT” stainless barrel from Criterion, a Savage-style barrel nut, a recoil lug, and a special barrel-nut wrench. Most of the Pre-Fit barrels are 24″ long and threaded at the muzzle. CLICK Here for all Pre-Fit barrel specs.
With this system you can easily re-barrel your favorite Remington rifle yourself in less than an hour. You don’t need to pay gunsmithing fees, or wait weeks (or months) for a busy smith to do the job. And the price is under $500.00. Kits are currently available for these chamberings: 6.5 Creedmoor, 6mm Creedmoor, .243 Win, .308 Win, .308 Winchester Magnum. You can buy with confidence — McRee’s Precision offers a Half-MOA Accuracy Guarantee with its pre-fitted barrel kits.
The stainless steel Barrel Nut is set up for 1 1/16 x 16 barrel threads, while the stainless steel recoil lug has a 1/8 inch removable locator pin and is set up for 1.0625 dia barrel threads.
McRee’s Precision sells Rem-action Pre-Fit barrel packages (complete with barrel nut, recoil lug, and wrench) starting at $489.52. Choose from five chamberings: 6.5 Creedmoor, 6mm Creedmoor, .243 Win, .308 Win, and .300 Win Mag. These Pre-Fit barrel kits come ready-to-install. All you need to do is remove your current barrel, place the recoil lug, spin on the new tube, follow the instructions for setting head-space with standard go/no-go gauges, then torque the barrel nut against the lug. NOTE: You may require a barrel vise and action wrench to remove the original barrel. Chambering-specific headspace gauges required. Minor inletting changes may be needed forward of the action.
The folks at McRee’s Precision say their Pre-Fit system offers many advantages: “Remington Pre-Fitted Barrel Kits have become popular over the years. If Savage can do it, why not for our Remingtons? Our [Criterion-supplied] barrels are spec’d to the McRee standard of performance. There are several places to get the tools required to remove your factory barrel correctly. Once you have your barrel removed all you have to do is follow the normal Savage procedure to install your new barrel. We recommend that you contact your local gunsmith for the install. Feel free to call us with any questions.”
Product Tip from Ed LongRange. We welcome readers’ submissions.
Kestros ZR Stock — Impressive Design for Competition
Review by F-Class John
Walk the line at just about any rifle competition and you’ll see your share of McMillan stocks. Known for crafting high-quality fiberglass/composite stocks, McMillan has long been at top choice for competitive shooters, hunters, and tactical marksmen. Now McMillan is out to dominate F-Open with the Kestros ZR stock. The Kestros line features several models, but the ZR represents the pinnacle of craftmanship. Each one is finished off by a single craftsman and takes roughly four times longer to create than any other Kestros. So when McMillan offered me a chance to test one out, I jumped at the opportunity.
The aluminum Z-Rail extends nicely from the front of the stock and has a nice contrast of metal against the matte finish of the stock. I inspected the rails and noticed that they are very cleanly machined — all the corners and rails were precise and sharp. As a result, I grabbed some 1000-grit sandpaper and just lightly knocked the edges and corners down just to keep from accidentally scratching myself or my gear.
Lead time for a ZR is currently 6-9 months. I was like a kid on Christmas when mine arrived after seven months. Holding a Kestros ZR is definitely a unique experience compared to a traditional wood stock and you can’t help but feel like you’re holding something special. I chose three shades of blue that transitioned dark from the butt stock to lighter on the fore-end in a spectacular flame pattern. With McMillan, there are thousands of possible color and pattern combinations. These color/pattern options are outlined on McMillan’s Gallery Page.
The Kestros ZR comes fully inletted with pillars. I was able to bolt my Defiance action right into the stock “as is” without a bedding job. (McMillan states bedding is not required, though this is certainly something most Kestros owners will do). I threw in my action, fit a couple action screws and tightened it all down. I was amazed at how nicely it all fit together with even the little details like the port cutout being perfectly smooth with my action port. I loaded up some .284 Win rounds and headed to the range to test the new stock at 100 yards.
Here are examples of targets shot with the Kestros ZR at 100 yards.
During initial range testing (see above) I shot nine groups for vertical and all of them were under 0.40″ with the smallest being .08″ of vertical. I topped off the testing by shooting a 200-11X the next week at my club match. The thing that really stood out was how smoothly the stock tracked with its lower center of gravity while shooting free recoil and ultimately this translated to success on target.
Low-Rider — You may find that because of how low the Kestros rides as well as its additional length due to the Z rail, you may require an extension for your front rest.
CONCLUSION — Great Modern Low-Profile F-Class Stock
Overall the Kestros ZR exceeded my expectations. After a small learning curve, it was a joy to shoot and it performed great. As someone who believes in the power of muscle memory, I found each time I transitioned between the Kestros and my traditional wood stocks there was a slight adjustment period but not enough to impair accuracy in any way. Something to consider is that because every Kestros is made to the same dimensions, it makes owning multiples an easy process of switching between guns without any need for readjustment.
For those willing to put in the practice, your patience will be rewarded, and I think most shooters will find the Kestros ZR could become their new favorite stock. If you’re in the market for a new F-Open stock, the Kestros ZR is definitely one to consider.
Tips for Ordering a Kestros ZR
Ordering the Kestros ZR is a simple process thanks to McMillan’s online order form. While there are a number of options available, McMillan has a helpful guide that walks you through each one to ensure you get exactly what you need. While filling out my form I realized that because I have a custom-designed action, I needed some help, so I gave McMillan a call. The staffers were incredibly helpful and their knowledge of all the major actions out there made answering my questions a snap. I liked the fact that there is no set, fixed price on any of the stocks. The pricing system allows customers to get just what they want (within limits) and not have to pay for anything they do not want or need.
A few seasons back, our Editor and his friend Joe Friedrich flew to Texas to visit Gene Beggs and test rifles in Gene’s 100-yard indoor tunnel. That was a once-in-a-lifetime opportunity to shoot centerfire rifles in such a test facility. Here’s our report…
The South Texas Tunnel
Gene Beggs operates his own 100-yard indoor tunnel and rifle testing facility just outside of Odessa, Texas. Surrounded by tall fencing, this place really looks like a “Area 51″ secret military facility.
In his South Texas tunnel, Gene provides instruction and “tunnel time” for serious benchresters looking to improve their skills and optimize the accuracy of their rifles. Along with teaching the fine points of short-range benchrest, Gene employed his tunnel to develop a pair of radical rifles, one chambered in 220 Beggs, a slightly modified 220 Russian, and a second chambered in 6mm Beggs, a necked-up version of the 220 Russian that retains the original body taper and shoulder angle.
Radical Skeleton Stocks with Aluminum Sled mounted to Barrel
Both rifles shared a skeleton design which uses the Stiller Cobra or Viper action as a central load-bearing member. Remarkably, there is no conventional fore-arm at all. Gene has bolted, directly to the barrel, a 3″-wide bag-riding aluminum sled. The sled was not designed as a mid-barrel tuner, but it might have some beneficial effects in that regard. However, the tuning functions are handled by two concentric rings threaded to the muzzle. Gene believes that with minor rotations of his front tuning rings, he can dial the gun into tune and the tune can be easily adjusted as conditions warrant.
Do Mr. Beggs’ guns shoot? Absolutely. We had the chance to visit Gene in Odessa. We shot both the 220 Beggs-chambered rifle, and its 6mm Beggs-chambered cousin. Both rifles are nearly identical, though the Heavy Varmint-weight 220 has a longer, 27″ barrel compared to 22″ for the Light Varmint 6mm.
In the tunnel, the 220 HV, with a no-turn-neck 220 Beggs chamber, produced three-shot groups in the low ones and zeros right out of the gate, even before the tuner was optimized. With a barrel with over 1000 rounds through it, after firing 40 rounds without cleaning, Gene produced a tiny 5-shot group in the low ones. The first shot was slightly high (a common occurrence in the tunnel according to Beggs). The last 4 shots, rounds 42-45 since the barrel had been cleaned, went into 0.084″. This rig, though radical in the extreme, certainly appears fully competitive with more conventional BR rigs, and it tracked superbly, with no hopping or rocking on the bags.
220 Beggs — Simple, Accurate, Efficient
We were also very impressed with the 220 Beggs cartridge. It’s basically a plain 220 Russian with a sharper radius at the neck-shoulder junction. Gene has commissioned a 220 Beggs reamer with matching seating and full-length sizing dies. The little cartridge achieves 3600+ fps with a 52gr bullet, pushed by Benchmark powder.
Less Recoil Than 6PPC — From what we could tell during our short visit, the 220 Beggs is easy to load for, and performs exceptionally well with either turned (.250″) or no-turn necks. The recoil was noticeably less than a 6mm PPC, making the gun a joy to shoot. This round, we felt, could also be an outstanding varmint cartridge. The velocity is there, and we don’t think any other 22-caliber varmint cartridge is going to beat it for inherent accuracy.
As for the 6mm version, Gene told us: “The 6mm version of the cartridge performs best with Hodgdon’s H4198 Extreme, but the 220 has proven it will shoot well with just about anything you put in it including N133, H322, Benchmark, 8208, Norma 200 etc. It is the most trouble-free, user friendly cartridge I have ever worked with and will compete heads-up with anything. It’s also very easy on the shoulder.”
Gene Beggs sells components (reamers, dies etc.) for the 220 and 6mm Beggs, and also, under special circumstances, offers training/testing sessions in his West Texas Tunnel on an appointment basis.
Readers who have just recently discovered the Daily Bulletin may not realize that AccurateShooter.com has hundreds of reference articles in our archives. These authoritative articles are divided into multiple categories, so you can easily view stories by topic (such as competition, tactical, rimfire, optics, shooting skills etc.). One of the most popular categories is our Technical Articles Collection. On a handy index page (with thumbnails for every story), you’ll find over 120 articles covering technical and gunsmithing topics. These articles can help you with major projects (such as stock painting), and they can also help you build more accurate ammo. Here are six popular selections from our Technical Articles archive.
Stress-Free Pillar Bedding. Richard Franklin explains how to do a top-quality bedding job, start to finish.
Gun Safe Buyers Guide. Our comprehensive Safe Buyers Guide examines the key features to consider in a safe — Wall Thickness, Volume, Shelving, Fire Rating, Lighting, Weight and more. We also explain the Pros/Cons of Dial vs. Digital (Keypad) locking systems.
Savage Action Tuning. Top F-TR shooter Stan Pate explains how to enhance the performance of your Savage rifle by optimizing the torque settings of the action screws.
Complete Precision Case Prep. Jake Gottfredson covers the complete case prep process, including brass weight sorting, case trimming, primer pocket uniforming, neck-sizing, and, case-neck turning.
Stock Painting Instructions. Step-by-step guide for stock painting by expert Mike Ricklefs. Mike shows both simple coverage and fancy effects.
Ultrasonic Case Cleaning. This article reviews the recommended process for cleaning cartridge brass with ultrasonic cleaning machine. We cover the right liquid solutions, processing times, and case drying options.
Velocity vs. barrel length — How much speed will I sacrifice with a shorter barrel? Hunters and competition shooters often ask that. Today we DO have solid answers to that question for many cartridge types thanks to Rifleshooter.com.
Bill, Rifleshooter.com’s Editor, explained his test procedure:
“I gathered four different types of factory Federal 224 Valkyrie ammunition, the 90gr Sierra MatchKing (SMK), 90gr Fusion soft point (SP) (referred to a Fusion MSR), 75gr Total Metal Jacket (TMJ) and 60gr Nosler Ballistic Tip Varmint (NBT). After a brief barrel break in and zero, I fired 5 rounds of each cartridge at each barrel length (except the 75 TMJ, I fired 4 rounds at each barrel length due to limited resources). I recorded the average muzzle velocity and standard deviation for each ammunition and barrel length combination and cut the barrel back 1 inch and repeated the process. I recorded barrel lengths from 28″ to 16.5″ (I try to save these barrels as finished 16″ tubes so they don’t go to waste).”
The Heavy Bullet 90gr Ammo Lost about 21 FPS per Inch
How did the test turn out? You’ll find all the results summarized in helpful tables with inch-by-inch velocity and SD numbers. For the two, 90gr ammo samples, results were similar. The 90gr SMK ammo started at 2782 fps (28″), finishing at 2541 fps (16.5″). That’s a loss of 241 fps, or 20.96 fps average per inch of length. The ammo loaded with 90gr Fusion SPs started at 2797 fps (28″) and ended at 2561 fps (16.5″), a drop of 236 fps. That’s 20.5 fps loss per inch. NOTE: Ambient temperature during the test was 45° F. You could expect the overall velocities to be a bit higher during hotter summer months.
With a the smaller bullets, the effect was even more dramatic. As you’d expect they started out faster. The ammo with 60gr Nosler Ballistic Tips (NBT), a good choice for varminters, started at 3395 fps (28″), and declined to 3065 fps (16.5), a total velocity drop of 330 fps. Average velocity loss was 28.7 fps per inch of barrel length. Rifleshooter.com also tested Federal 75gr TMJ ammo.
About the .224 Valkyrie Cartridge
The new .224 Valkyrie was introduced late last year as a Hot Rod cartridge that will work in AR15s. Designed to rival the .22 Nosler while still running well in ARs, the new .224 Valkyrie offers excellent long-range performance when loaded with modern, high-BC bullets. We expect some bolt-action PRS shooters might adopt the .224 Valkyrie. Why? Reduced recoil. With the 90gr SMK, the .224 Valkyrie offers ballistics similar to the 6.5 Creedmoor but with significantly less felt recoil. Check out this chart from Federal showing comparative recoil levels:
.224 Valkyrie vs. .22-250 Remington
The Social Regressive explains: “There are two key reasons why the .224 Valkyrie is unique and desirable. First, it is specifically designed to fit the limitations of the AR-15 platform. It does so even when loaded with gigantic bullets, like the 90-grain SMK that Federal announced. The .22-250 Rem is too long and too fat to work in the AR-15 platform; it needs an AR-10 bolt and magazine.”
The new .224 Valkyrie is basically a 6.8 SPC case necked down to .22-caliber. You can use your existing AR15 lower, but you will need a dedicated .224-Valkyrie upper, or at the minimum a new barrel, modified bolt with proper bolt face, and 6.8-compliant mags.
This week, Tom interviews gun restoration expert Doug Turnbull (
Do I Need to Break-In a New Rifle Barrel?
30 BR dies are readily available from a number of manufacturers. I personally use Wilson neck and seating dies with a Sinclair Arbor press, but Redding and Forster both supply high-quality threaded dies for use in a conventional press. For under $100.00 US, custom full-length dies can be obtained from 
Gene Beggs operates his own 100-yard indoor tunnel and rifle testing facility just outside of Odessa, Texas. Surrounded by tall fencing, this place really looks like a “Area 51″ secret military facility.
Do Mr. Beggs’ guns shoot? Absolutely. We had the chance to visit Gene in Odessa. We shot both the 220 Beggs-chambered rifle, and its 6mm Beggs-chambered cousin. Both rifles are nearly identical, though the Heavy Varmint-weight 220 has a longer, 27″ barrel compared to 22″ for the Light Varmint 6mm.
Velocity vs. barrel length — How much speed will I sacrifice with a shorter barrel? Hunters and competition shooters often ask that. Today we DO have solid answers to that question for many cartridge types thanks to 
Image from Social Regressive 
