The Ultimate Firearms Destination for the Gun Lifestyle

The JJR-375 Rifle, Helping Take the “E” Out of ELR Shooting

Photos by Niccole Romanoski and @photobucketlist

I’m probably the least-experienced long-range shooter at RECOIL. I don’t shoot PRS. I didn’t go to sniper school or even a squad designated marksman course in the military. I didn’t ever work as a contract designated defensive marksman during my freelance security years. Prior to taking on this article, my farthest shot was a lucky hit with a .50 BMG bolt gun at 1,240 yards, courtesy of Iain’s superb wind calls.

As the industry continues to spend more money on design and development, and as tight tolerance machining technology becomes cheaper and more prolific in the firearms world, the art of Extreme Long Range shooting (ELR, for short) will only become more common and more accessible to the less-experienced rifleman. The growth of this particularly niche sport is what makes the author’s utter lack of experience so poignant.

One company making their mark in the ELR world is JJ ROCK. JJ ROCK is a joint venture between Jon Geib, John Kalil, Rock McMillan, and Duncan Davis. Between them, they bring more than six decades of experience in custom-rifle building and precision shooting. At time of writing, they’ve partnered with Applied Ballistics to build a prototype rifle in response to military requests for an ELR-capable sniper rifle system. The Applied Ballistics submission will be based around JJ ROCK’s Super XL action. Previous to his work on the Super XL action, Rock McMillan designed the Tac-50 action, which holds the honor of being used in four of the 10 longest sniper kills currently on record.

JJ Rock-13

The Prater Precision Sniper Data Board, though intended for DOPE cards, easily held our ballistic computer.

The Super XL is the heart of their new JJR-375 rifle, which recently showed its potential at the 4th annual King of 2 Miles competition. The JJR-375 scored 2nd, 4th, and 8th round hits at 2 miles. Team JJ ROCK also won the cold bore challenge with a 1st-round hit at 1,691 yards. (See Issue 33 for more info on the KO2M competition.) With a couple of pretty significant stats on their card already, we couldn’t resist running a JJR-375 for ourselves. The owners gave us the chance to sit in on one of the military precision rifle classes to see if we could live up to the potential of this purpose-built gear.

The Machine
The Super XL action was designed specifically to engage targets in the 2- to 3-mile distance envelope. No small feat for man-portable, shoulder-fired weapon. The Super XL is machined from heat-treated 416 steel. The bolt itself is NP3 coated and features two beefy lugs. Also finished in NP3 is the M16-style extractor that’s specifically designed to handle cartridges with a 0.640-inch case head diameter. There’s even a firing pin guide system.

According to JJ ROCK, this facilitates faster lock times and more consistent primer strikes — proof that when you’re talking ELR ranges absolutely everything matters. The receiver itself features a locking lug insert manufactured from an undisclosed material that’s supposedly up to three times stronger than the receiver itself. The intent here is to be able to use a more compact lug design without sacrificing rigidity against the increased recoil of larger long-distance loadings. Our test rifle, as its name would imply, was chambered in 375 CheyTac, but by the time you read this JJ ROCK will have actions available in both 416 Barrett and 50 BMG. The Super XL is compatible with any Remington 700 pattern trigger system, and the JJR-375 comes off the rack with a Timney 510 that includes a bottom safety.

Threaded into the massive Super XL action is a 29.5-inch Proof Research carbon-fiber barrel with a 1:9 twist, topped with an American Precision Arms Gen II XX Brake. While the use of carbon fiber definitely helps shave some fat, the rifle still weighs in at nearly 20 pounds, before you give it glass or legs. While it’s nobody’s backpack gun, it still weighs less than an M240 machine gun, and can reach a whole lot farther. The barreled action is nested in a Cadex Dual Strike folding chassis. As is the current trend in military sniper systems, the Dual Strike is highly modular with screw-in rail sections and a skeletonized side-folding stock that’s adjustable for both comb height and length of pull.

The Shot
We spent several days with running this rifle alongside some DoD personnel in one of JJ ROCK’s precision rifle classes. Unfortunately, they don’t currently offer open enrollment classes, but the training event allowed us to run the gun under tutelage of the guys who built it. Our class was taught by Jon Geib and Chad Prater of Prater Precision, both veteran military snipers. Our test gun was equipped with Prater Precision’s Sniper Data Board. This ingenious little accessory clamps onto any Picatinny rail and provides a mounting platform for miniature whiteboard-type cards than you can use to keep your DOPE.

During our class, we got the chance to run another JJROCK build, this suppressed 7.62mm bolt gun.

During our class, we got the chance to run another JJROCK build, this suppressed 7.62mm bolt gun.

For the rest of this article, subscribe here: RECOIL Issue 40


Visit https://www.jjrockco.com/

Subscribe to the Free
Newsletter