The parts, which I ordered from Brownells include: I built the gun using the action from a Tikka T3 in 22-250. In this case using a Modular Driven Technologies (MDT) ESS chassis. It is different from the others in a few ways: first, it is built on a Tikka action, and second, it is very much a chassis gun. The first two used Remington 700 actions, the gun I am using for this test was just recently built. I’ve built three 6mm BRs over the last couple of years. While my gun shoots fairly well, it doesn’t match the performance of some of the bench guns that are out there, and I am OK with that (one of traditional stock guns I built managed a 1.5″ 5-shot group at 600 yards a couple of years ago). The 6mm BR diehards may be upset with my groups. In this post I am going to take a look at the 6mm BR in a chassis rifle with a detachable magazine. Lately, the 6mm BR (and its improved versions the BRX and Dasher) have found more acceptance in field type rifles. Use of the 6mm BR in a AICS magazine requires a new spacer and follower system. It has a short case that is hard to feed and eject, that means it is traditionally relegated to single shot applications. While it may require a little bit of fiddling around to get it to work from a magazine, it burns less powder than it’s competition and is quite pleasant to shoot. Next to its contemporary counterparts (above, left to right 6mm BR, 243 Winchester, 6×47 Lapua, 6 Creedmoor, 6,5×47 Lapua, 6.5 Creedmoor, 260 Remington and 308 Winchester), the 6mm BR (above, left) sticks out as a stubby little round. The combination of a low recoil impulse and excellent performance at the 600 yard line have earned it a great reputation among the target shooting crowd (It is such a great cartridge, Paul at Accurate Shooter/ actually built a website around it). The 6mm Benchrest (6mm BR or 6BR) is a nifty cartridge.
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