Last year, our friend Roy Bertalotto acquired a budget-priced Kimber 82G rimfire target rifle from the CMP. The Kimber comes with an oiled-wood stock that works fine for three-position training, but Roy wanted to shoot the gun for the bench. The original Kimber stock, with its narrow, radiused forearm, was not ideal for this purpose. Roy wanted a wide, flat fore-end, which is much more stable in the bags. Rather that spend hundreds on a new benchrest stock, Roy modified his Kimber’s original stock by slicing a section off the bottom of the stock and then replacing this with a 3/4″ X 2 3/4″ X 15″ piece of walnut. The finished product is in the second photo below.
Roy explains: “The modification I did on my Kimber 82G stock was done using a milling machine, hand planes, files, die grinder and sand paper. It can also be done with simple hand tools — it will just take longer. The first step is removing the wood on the bottom of the fore-end. This was accomplished in the milling machine. A scrap piece of 2X8 was mounted to the milling machine’s table and the surface milled to be perfectly flat. The Kimber stock was screwed to this 2X8 with two large screws and the bottom of the stock was milled flat. Once this was done, a piece of 3/4″ X 2 3/4″ X 15″ walnut was glued using West System epoxy to the cut out area. I use West System epoxy in boat building, but any good wood glue will work.” WATCH project stages in Slide-Show below:
After gluing the new bottom piece in place, Roy milled the sides to provide side flats with a radius to transition from the wider lower section to the narrower upper part of the fore-end. As a added enhancement, Roy contoured the rear of the fore-end to blend with the rear of the stock, adding what he calls “1965 Ford Mustang side scoops”. Roy then used a Die Grinder with a 1.5″ sanding wheel to modify the wrist area to provide more thumb relief.
Following the cutting, milling, gluing, and shaping, Roy sanded with 150 grit and 300 grit sandpaper before applying multiple coats of Tung Oil. Once the main stock was completed, Roy completed the project by crafting an extended buttplate from a couple pieces of 1/8″ aluminum and two 1.5″ aluminum tubes, “all polished to a slightly less than mirror finish”. NOTE: This metal buttplate assembly was made from scratch (other than the pad). This is not an aftermarket extension kit.
Overall the gun turned out very nicely. Log on to Roy’s RVB Precision webpage to learn more about this Kimber stock modification project, and view more photos of the building process.
After more than 60 years as a competitive target shooter and gunsmith, McLane (Mac) Tilton, proprietor of MT GUNS, is passing the baton to his chief gunsmith/machinist, Mark Chesebro. “Mark has acquired the assets of MT GUNS and will be its successor. I’m very pleased that Mark is establishing Chesebro Rifles and that he will continue to provide highest quality competition target rifles in the tradition of MT GUNS,” Tilton announced today.
Tilton expressed his complete confidence in Mark’s ability to provide a seamless transition for MT GUNS customers: “He attended the well-respected gunsmithing course at Yavapai Community College in Prescott, Arizona, followed by four years with Bill Atkinson at H.S. Precision, where he perfected techniques in chambering and rifle smithing. After eight years of general gunsmithing in Everett, Washington and as an aerospace machinist, tool maker and CNC programmer, Mark relocated to Arizona, where he joined the team at Ruger. He came to MT GUNS in 2004 and we were very impressed with his inventive capabilities.”
“In 2006, Mark and his wife, Lisa, answered a call from their church to fulfill a three-year teaching mission in Ecuador. When he returned in 2009, he rejoined our team at MT GUNS and has continued to develop his innovative ideas and techniques, including the development of a press to insure perfect alignment when rebarreling Anschuetz rifles, as well as a centerfire conversion for BSA Martini rifles. He has also developed an entire system for converting the Anschuetz 54 action from a single shot to a magazine-fed repeater. Also, he’s mastered the critical alignment when bedding Vee-blocks for Barnard and Anschuetz actions.”
Chesebro Rifles will continue to build competitive Palma, F-Class, and Benchrest rifles using the Barnard action, as well as the very successful BSA and Anschuetz Rimfire Bench Rifles. Contact for Mark Chesebro at Chesebro Rifles is: info [at] chesebrorifles.com.
McLane Tilton and Bruce Duncan will still be available at MT GUNS for any customers with unfinished business.
McMillan regularly offers a selection of inletted “Specials” stocks. You should check McMillan’s Specials Page regularly to set if there’s a stock that suits your next build. Not only can you save months of wait time, but you save on the cost of the stock. Many of the Specials stocks are priced $100.00 or more below normal retail. From the list on the Stock Specials Page, choose your action and find a great deal on a McMillan stock.
Shown below are inletted “Specials” currently displayed on the McMillan website. This is only a partial list — there are many more stocks available. If you’ve got the appropriate action, you can save big bucks (and avoid wait periods), by ordering from McMillan’s “Specials” list.
Tooley MBR Stocks for Various Actions
#2924 MBR 70% WHITE 30% BLACK MARBLE, LBRP STILLER PYTHON, SINGLE SHOT, REM ADL T/G, NO FR SCREW HOLE, 1.375″ STRAIGHT B/C, 1″ DEC PAD, 13.5″ LOP. $375.00.
#3000 MBR LT BLUE, GRAPE, PURPLE FLAME PATTERN, SOLID GLASS FILL (7LBS), RH L700, SINGLE SHOT, REM ADL T/G, 1.250″ STRAIGHT TAPER, 1″ DEC PAD, 13.5″ LOP. $425.00.
#3001 MBR 70% TURQOUISE 30% BLACK MARBLE, RBLP, LAWTON 7500 LA, 1.36″ DIA, SINGLE SHOT, REM ADL T/G, KRIEG HV B/C WITH 4″ CYL, 1″ DEC PAD, 13.5″ LOP, ALUM. PILLARS. $450.00.
Edge Benchrest Stocks for BAT Actions
#2909 EDGE HV PURPLE TO TURQUOISE FLAME, BASIC INLET FOR BAT SV, STOCK WEIGHS 2 LBS 2 OZ. $225.00.
#2910 EDGE HV BLUE, DK BLUE, PURPLE @ BUTT FLAME PATTERN, RIGHT BOLT LEFT PORT, EJECTION PORT IS 3″ LONG, BAT MB round 1.530″ x 8.5″, SINGLE SHOT, FAC BAT T/G. $300.00.
Stocks for Stiller Actions
#2923 HTG/P 34% BLK 33% DK GRAY 33% LT GRAY MARBLE, MAG FILL, RH TAC 338, BDL F/P, CUSTOM BBL 1.450″ taper to 1.250″ @ 10″, 1″ DEC PAD, 13.5″ LOP, 3 SS STUDS. $400.50.
#2971 LH REM HUNTER 75% BLACK 25% LT GRAY MARBLE, LH PREDATOR LONG ACTION, BADGER M5 DBM, 9/16″ SCREW HOLES, REM VAR B/C, 1″ DEC PAD, 13.5″ LOP. $375.00. 5/15/12 – 3 in stock.
Stocks for Various Remington Actions
#2911 REM VARMINT PAINTED BLACK, RH S700, SURGEON DBM, REM MAG B/C, 13.5″ LOP, 1″ DEC PAD, 3 STUDS, FLUSH CUPS ON LH SIDE, ALUMINUM PILLARS INSTALLED. $450.50.
#2997 MCMILLAN HUNTER PAINTED OLIVE, RH S700, REM DBM, FAC SPORTER B/C, 1″ DEC PAD, 13.5″ LOP, 2 STAINLESS STUDS. $425.00.
FNH has released a “TBM” upgrade kit for owners of FNH SPR rifles with the standard .308-size, 4-round DBM magazine assembly. This kits lets current SPR owners utilize the TBM (tactical box magazine) assembly with 5- and 10-round magazines. This easy-to-install kit provides SPR owners with an ambidextrous mag release, along with the ability to use larger-capacity box magazines.
This $449.00 Kit comes with new trigger guard/bottom metal, both 5-round and 10-round TBM magazines, new action screws and instructions. For SPRs with box mags, this is a drop-in, no-gunsmithing upgrade that does not require gun modification or fitting to the rifle. (TSRs or PBRs with DBM equipment might require fitting by a gunsmith). Retrofit on SPRs can be accomplished in minutes with common tools (torque wrench required). Kits are available now through the FNH USA E-Store, Brownells, and Midway USA (item number 62655-01, MSRP $449).
by Robert Whitley After Accurate Shooter published the July 31, 2010 Daily Bulletin feature on 6mm BRX Myth-Busting With Bob Crone, further research reveals that there’s more to tell about the BRX, its origins, and its original specifications.
6 BRX Myth-Busters Follow-Up Challenge
I wanted to obtain a print reflecting the true original dimensions of Bob Crone’s 6mm BRX reamer. I hoped to verify the head spacing of the reamer to be .100″ longer than a 6mm BR, and I also wanted to see how Bob’s original print compares to 6mm BRX match reamers currently considered to be the “standard in the industry”.
Recreating the Original 6mm BRX Reamer Print
Clymer Precision was contacted to obtain a print of Bob’s original reamer. Todd Wilms, the current owner of Clymer Precision (and a heck of a nice guy as well) went back in the Clymer archives and pulled the records of the dimensions of Bob Crone’s 6mm BRX reamer. Todd then entered them into Clymer’s current reamer drawing program and has generated a current drawing reflecting the original 6mm BRX reamer. The print (see below) confirms the head space of the 6mm BRX to be .100″ longer than a 6mm BR (i.e. 1.267″ min at a shoulder datum diameter of .350″).
Comments on Bob’s 1996 Clymer Reamer
In many ways, the print dimensions are very close to what is currently recognized as the “standard in the industry” for 6mm BRX reamers, however in other ways there have been some definite changes:
A. Body Diameter: A chamber body diameter of .470″ is still in wide use today with 6mm BRX reamers (that’s measured .200″ forward of the bolt face). The current Lapua 6mm BR brass has a web diameter very close to this diameter and one should be wary of trying to tighten this dimension. If anything, running a little looser (like the .4708″ dimension similar to that used with the 6mm Dasher) would not hurt the performance of the 6mm BRX cartridge a bit.
B. Shoulder Diameter: Bob’s original reamer had a shoulder diameter of .4609″ (the same as a 6mm BR Norma), however many current 6mm BRX reamers now use a .460″ shoulder diameter which helps avoid overworking the brass there if readily available commercial dies are used.
C. Max Chamber Length: Bob’s original print had a “max chamber length” of 1.570″ (the same as a 6mm BR Norma), however many of the current 6mm BRX reamers have shortened this up a little. This is because, when 6mm BR brass is fire-formed into 6mm BRX brass, typically the brass shortens. Indeed, this author’s 6mm BR brass shrinks in OAL from around 1.555″ to around 1.547″ when it is fire-formed to 6mm BRX brass. A max chamber length in the range of 1.560″ – 1.565″ is seen often with 6mm BRX reamers these days.
D. Neck Diameter: While Bob’s reamer has a .262″ neck, this has for the most part given way to either a .269″ (sometimes .268″) turned neck, or a .272″ (sometimes .271″) no-turn neck, with the neck diameter typically selected based on the actual dimensions of the brass to be used.
E. Throat Angle: Bob’s throat angle was one and a half degrees, which seems to be standard and in wide use today with the 6mm BRX.
F. Freebore: Bob’s freebore length was 0.00″ because his smith used a separate throater to set the throat length Bob wanted for specific bullets. These days, a built-in freebore in the range of .104″ – .125″ seems to be very common with 6mm BRX reamers. Freebore in that range is seen by many as a good choice for the readily available 105- to 108-grain 6mm bullets.
6mm BRX — Real World Specs
Here are measurements on Robert Whitley’s 6mm BRX brass, as fire-formed, full-length sized and ready to load in a no-turn chamber.
Base to shoulder = 1.170″
Base to neck/shoulder junction = 1.333″
Overall case length (fired 2x and re-sized 2x) = 1.547″
Shoulder diameter (resized) = .459″
Diameter .200″ forward of base (resized) = .470″
Neck diameter loaded = .269″
Paul Liebenberg of Pistol Dynamics is widely considered to be one of the finest pistol-smiths on the planet. When you ask other well-known pistol-smiths whom they would rank among the very best, Liebenberg is a consensus pick. And Paul’s work is in high demand. There is a multi-year-long waiting list for his custom pistols, mostly built on 1911-platforms.
Now Liebenberg is sharing his pistol building/tuning knowledge through a professionally-produced video from Panteao Productions. In this two-Disc DVD, Paul Liebenberg demonstrates the procedures he employs when crafting a custom 1911 pistol. The DVD covers all key aspects of customizing the 1911 pistol. Topics covered include: fitting barrel and barrel bushing, installing grip safety and thumb safety, installing and tuning the trigger, installing and tuning extractor and ejector, relieving the mag well, undercutting the trigger guard, lowering the ejection port, and much more. This is a rare opportunity to learn from a master gun builder like Paul Liebenberg. Panteao is accepting pre-orders for the DVD and expects it to be released shortly.
30+ Years Expertise
A trained industrial designer from South Africa, Paul Liebenberg was a member of the World Champion South African Practical Pistol Shooting Team. An NRA High Master and four-gun firearms instructor, Paul competed successfully in many disciplines in the shooting sports.
In 1983 Liebenberg immigrated to the USA and joined Pachmayr Gun Works in Los Angeles where he rose to manage the Custom Gun Shop. In 1985 he opened Pistol Dynamics in Los Angeles to build high-end 1911 competition handguns and Pachmayr pistols on contract to that company. Today Pistol Dynamics is based out of Palm Bay, Florida where Paul continues to build high-end 1911 pistols.
Our friend Pascal Fischbach from France offered us a sneak peak at the final production version of a new benchrest rig from Argentina. Pascal reports: “I’ll be in Buenos Aires soon and will meet Carlito Gonzales, maker of the CG M1 Thunderbolt benchrest rifle that performed so well at 2010 Supershoot and WBC10 last August in the hands of Dr. Cris Rando.” Pascal has ordered one of these rifles for the 2013 benchrest season. If you want more information about the CG M1 action or complete rifle, contact Pascal through his Facebook Page.
Pascal tell us: “The CG M1 action is a short, tight but smooth 3-Lug, Right Bolt, Left Port, Right Eject model. The receiver features a special 66mm-long tenon with threads in the center area and two bearing-centering areas on each side of the threads. Any gunsmith will be able to chamber additional barrels with the data and tools provided. This action offers strength and rigidity to enhance both accuracy and longevity. Carlito’s trigger is excellent — I recommend keeping it. The complete rifle will feature special quality rings that mate to the top of the receiver. Barrels can be chambered with your custom reamer or with CG’s conventional 6PPC reamer or even a PPC-AI chamber design (PT&G) that Carlitos realy likes. Price for the complete rifle will be very competitive.”
One reason this rifle performs so well is the innovative stock design. The fore-arm is very low profile in the front. At the back of the stock, an exaggerated Vee profile aids tracking and reduces vibration. Pascal says the stock tracks very straight for the first couple of inches during recoil, and the marked Vee in the rear makes it ride on the sides of the bag ears, not the bottom stitching. This helps quell vibration and improve damping. The carbon construction makes the stock “stout and stiff”.
The fluted 3-Lug Bolt is extremely well-machined.
The tang on the 2012 version has been shortened for weight reasons. There’s still plenty of bedding area on the main body.
Super-Sized Action Offered for Long-Range Rifles
For long-range shooters, Carlito Gonzales has also crafted a larger 600/1000m version of the CG M1 designed for bigger cartridges used in long-range competition. We don’t have any specifics on price or delivery date, but the action looks nice. The extended front section should provide excellent support for long, heavy barrels.
How long will a barrel last before the accuracy “goes south”? There are so many variables involved (powder type, bore diameter, bullet coatings etc.) that it’s hard to predict. You might say “Well, my buddy has a .243 and he got 1500 rounds before the throat was shot out” — those kind of comparisons can be useful, but they’re not very scientific, and they won’t help much if you’ve got a gun in a new chambering (such as the 6.5×47) for which long-term test results are lacking.
Is there a more reliable way to predict barrel life — one that will work for a broad range of calibers? Well, Forum member MikeCr has developed an Excel spreadsheet that accounts for a number of variables, and gives a pretty good estimate of useful barrel life, whether you’re shooting a .223 Rem or a 338 Lapua Magnum. Mike’s program predicts barrel life using five variables: 1) Bullet Diameter; 2) Powder Charge weight; 3) Powder Heat Potential (KJ/kg); 4) Pressure (in psi); and 5) Bullet Coating (yes/no). Mike provides a table with Heat Potential ratings for most popular powder types. The user needs to know the pressure of his load. This can be estimated with QuickLOAD.
You can download the lastest version of Mike’s spreadsheet below. You’ll need Excel or an Excel viewer to open the file.
Shown below is Mike’s Spreadsheet, with variables for a 6BR shooting 105gr “naked” bullets with 30.3 grains of Hodgdon Varget powder. The formula predicts 2401 rounds of barrel life. That corresponds pretty well to what we’d expect for a 6BR — about 2500 rounds.
Mike observes: “There has been alot of discussion lately related to cartridge design and resulting barrel life. This is a really important factor to consider amongst a myriad of choices. Barrel life is controversial, and subjective. There are no clear-cut standards for comparison. But a few years ago, I put together a spreadsheet based on Bart Bobbit’s rule of thumb. It worked pretty good, only occasionally failing some tests when validated against posted barrel lives.
According to Ken Howell, I had to account for pressure. And Henry Child’s powder temperature testing provided another piece needed. So, I’ve tweaked it here and there to pass more tests. From 223rem to 300 UltraMagnum. Another element added, but turned off is shot interval. I would need way more tests to lock in on this. But everyone knows, the faster you shoot, the worse the barrel life.
Anyway, another factor hard to define is ‘accurate’ barrel life. This cannot be quantified without standards. Barrels are replaced when expectations are no longer met. I feel that a [barrel] passes peak potential in a finite period due to throat erosion. But that don’t mean it’s toast, if it still shoots well enough. It’s just as likely that many of us never see that peak potential anyway. It’s a slippery thing. Point-blank BR competitors will toss a barrel when it leaves the 1s. I could get another 4000 rounds from it, and be content with its performance, I’m sure.”
NOTE: Mike says: “This spreadsheet may show a lower barrel life than you prefer. But it pretty well spotlights cartridges to stay away from if you plan much time at the range or in dog town.”
Editor’s Comment: We want to stress that Mike’s spreadsheet is a helpful tool, but it is not a definitive “take-it-to-the-bank” indicator of barrel life. Mike cautions that predicting barrel life involves so many different factors (including how hot the barrel is run), that the task is a bit like predicting tread life on car tires. Still, the spreadsheet is very helpful. It can certainly put shooters on notice that some chamberings (such as the 6-284) are likely to be a barrel burners. That can help you make a smart decision when choosing a chambering for your next rifle.
American Tactical Imports (ATI) has introduced its new ATI Omni Lower Receiver, a multi-caliber AR15 lower made of reinforced polymer. Since it was designed to milspec dimensions, ATI claims the Omni polymer lower is compatible with most current AR15 lower parts kits, grips and stocks. ATI says the durable polymer material “can withstand harsh environments as well as everyday wear and tear.” The Omni lower will be available as either a stripped lower, OR a complete finished kit including all lower internal parts and collapsible stock. ATI claims the Omni lower has tested reliably with .22 LR, 5.56×45 (.223 Rem), and .410 but is “not recommended for larger calibers“.
The Omni stripped lower has an MSRP of just $49.95 while the complete finished kit has an MSRP of $129.95. The Omni lower comes in either black or dark earth colors. The .22LR version is available now. The .223 (5.56) version is slated for release in August, 2012, and a .410 version will be offered in the fall. To learn more about the ATI Omni Polymer AR15 lower, visit www.AmericanTactical.us.
Editor’s NOTE: This story is based on a press release by ATI. We have not examined or tested the product. Accordingly we can give no opinions as to fit/function, durability or safety. Likewise, we cannot venture an opinion as to whether the ATI Polymer lower would be legal in restrictive jurisdictions such as California. Nonetheless, this is an interesting technology that may prove useful in some applications. For example, the inexpensive ATI lower could work well with the Crosman MAR177 AR15 Airgun Upper, keeping total system cost down.
The National Shooting Sports Foundation (NSSF), a longtime USA Shooting sponsor, has donated $100,000 to help support the USA Shooting Team and shooter development programs. This large donation will help the USA Shooting Team at the London Olympics and help support USA Shooting’s ongoing operations.
In April, the NSSF visited USA Shooting’s Colorado training center and interviewed marquee USA Shooting athletes and coaches. These video interviews, hosted on the NSSF’s YouTube Channel, feature noted Olympians, who provide useful tips on target shooting. In the video below, Olympic shooter and Team USA member Matt Emmons explains how to shoot a rifle from the kneeling position:
NSSF Previously Provided Funds for USA Shooting’s Electronic Targets
The NSSF has been a valuable contributor to USA Shooting for many years now. NSSF funds helped USA Shooting purchase electronic targets for its indoor ranges in Colorado Springs. In addition, the NSSF showcases USA Shooting Programs at the annual SHOT Show. This provides valuable exposure for USA Shooting’s talented shooter-athletes.
“The firearms and ammunition industry takes great pride in being a longtime sponsor of the USA Shooting Team,” said NSSF Managing Director of Business Development Randy Clark. “From its introductory junior programs to its elite athletes who soon will be representing our country in London at the Summer Olympic Games, USA Shooting broadens awareness of the challenging and fun sport of target shooting.”
After Accurate Shooter published the July 31, 2010 Daily Bulletin feature on 
30+ Years Expertise
How long will a barrel last before the accuracy “goes south”? There are so many variables involved (powder type, bore diameter, bullet coatings etc.) that it’s hard to predict. You might say “Well, my buddy has a .243 and he got 1500 rounds before the throat was shot out” — those kind of comparisons can be useful, but they’re not very scientific, and they won’t help much if you’ve got a gun in a new chambering (such as the 6.5×47) for which long-term test results are lacking.
The 
