April 7th, 2012

Ron Boyd Shoots 1.462" 5-Shot Group at 1000 Yards

Ron Boyd 1000 yards groupThis past weekend, Forum member Ron Boyd shot a 1.462″ five-shot Light Gun group at 1000 yards in an IBS benchrest match at the MidWest Benchrest Club in Yukon, Missouri. Ron shot a 6mm Dasher with Bartlein barrel and PR&T stock. Ron’s 1.462″ group is 0.065″ off the existing IBS 1000-yard Light Gun record. Ron’s group also happens to be .011″ smaller than the current NBRSA 1K Light Gun record, 1.473″ shot by Bill Schrader in 2002. (But this is not counted by the NBRSA since Ron shot in an IBS match.) Ron’s group was shot in the first relay of the day, in good conditions. The group had three (3) shots clustered in under one-third inch (0.03 MOA)!

Ron Boyd 1000 yards groupThis is truly a spectacular achievement. We think this has to been one of the smallest five-shot groups ever shot at 1000 yards, and probably the smallest ever with a 6mm cartridge. At 1000 yards, 1 MOA is 10.47″. This means that Ron’s group measured in at 0.1396 MOA! To give you an idea of how small Ron’s group really was, at left is a 1.462″ circle shown at 100% scale, along with a quarter at 100% scale.* The circle represents the center-to-center distance of Ron’s five shots at 1000 yards. Total vertical dispersion was just under 1.2″ for five shots. The vertical for the top four shots (measured with OnTarget software) was just 0.398″! Shown below is a flat-bed scan of the actual target. Notice the tight cluster of 3 shots touching. That’s a dime in the photo added for scale.

Ron Boyd’s 6mm Dasher Load
Ron Boyd 1000 yard groupRon loaded a stout charge of Long Range Match surplus powder with Spencer 103gr bullets seated about .010″ OFF the lands. The bullets were “right out of the box”, NOT pointed. This powder has burn-rate characteristics very similar to Alliant Reloder 15, and Ron used his regular RL15 charge, adjusted by half a grain or so. Ron was using no-neck-turn “brown-box” Lapua 6BR brass formed into the 40° improved 6mm Dasher case. The unturned, loaded case necks measure about 0.2695″, yielding .0015″ total clearance in a 0.271″ chamber. The brass used for the 1.462″ group had seven previous firings. Ron anneals his brass after every firing using a Benchsource annealing machine. Ron told us: “The Benchsource is the greatest annealing machine there is, as far as I’m concerned.” Ron ultrasonically cleans his brass and then tumbles his brass after the ultrasound process. He does NOT use an internal neck lubricant. He does NOT uniform his primer pockets and he does NOT ream his flashholes. Ron believes this load was running “right around 3000 fps”, but he has not chron’d it yet using the new Bartlein barrel.

Ron Boyd’s 6mm Dasher Light Gun
Ron’s 17-lb Light Gun featured a BAT SV Action, Bartlein 30″ 1:8″ twist, 0.237″ land barrel, and Precision Rifle & Tool “Hammerhead” benchrest stock with 5″-wide wings in front. This stock weighs 4 lbs 1 oz. with an aluminum butt plate and is about 36.5″ long with integrated rails on the bottom of the “wings”. Ron’s friends Rich Griffin and Jerry Kloeppel did the chambering and bedding. Ron recently put the Bartlein barrel on the gun. Ron estimates that the barrel had only 40 rounds through it when it produced the 1.462″ group. Ron tells us: “This new barrel is great, and the 5″ PR&T stock really works. I luckily pulled the trigger at the right time.” Ron told us that this rifle shot in the high ones/low twos at 100 yards during testing.

PR&T Hammerhead Stock (catalog photo)
Precision Rifle and Tool hammerhead rifle stock

*The circle and quarter should appear “true size” when viewed at the most common monitor resolution. If you are running a higher resolution on your monitor, the illustration will appear small than actual size.
Permalink Competition, News No Comments »
May 9th, 2011

New Low Boy Benchrest Stock from Precision Rifle & Tool

Ray Bowman of Precision Rifle & Tool LLC (PR&T) has a new stock design, the Low Boy Benchrest, that combines the successful features of PR&T’s F-Class stock with a rear end better suited to shooting from the bench. As you may know, PR&T’s F-Class stock, in the hands of Charles Ballard and others, has been hugely successful in F-Class competition. The new Low Boy Benchrest stock borrows the same low-profile front end, but it is different from the tang rearward.

While the Low Boy F-Class stock is designed so you wrap your thumb around (like holding a pistol), the Low Boy BR stock is designed so you can slip your hand along the side, with thumb rested lightly behind the tang, in a central position. Unlike the F-Class stock, which is designed for full grip “hard-holding”, this stock is designed for shooting with a “light hold” style (or even free recoil). These stocks are very straight dimensionally, so they track well.

We think this stock will work very well for 600-yard and 1000-yard Light Gun Benchrest competition. This Editor likes the stock enough that I am considering using a Low Boy Benchrest stock for a future Light Gun project with a Stiller Viper Drop-Port. The Low Boy BR stocks are affordable — starting at $330.00 for an un-inletted version with a 3″-wide fore-end. Inletting adds just $25.00 to the total. PR&T can also pillar-bed your action in the stock for an additional $225.00.


Handsome Bat-Action BRX in Low Boy BR Stock
The blue-stocked rifle in the photos belongs to FORUM member Bo W. (aka “Sighter”). It is a 6BRX with a BAT MB, multi-flat action. The finish and painting work on the PR&T Low Boy BR stock was done by Tuck. Sighter rates the stock highly, but he thinks the standard configuration sits a bit high in the back: “I like the stock and it tracks fine, but I feel the F-Class style height causes it to ride a bit higher in the bags than needed. I talked about this with Ray Bowman [PR&T owner] and have since ordered two more Low Boy BR stocks. With the last two, Ray cut about 3/4″ off the bottom of the stock butt and kept about a .67″ flat so a double-stitch bag will work. It is now more similar to a Tracker.” Shown below is a Low Boy BR stock with the reduced height option.

Permalink Gunsmithing, New Product 2 Comments »