Originally Posted By: DiRTY DOGIn the AR15, 6ARC performance with 55/65gr bullets doesn't seem to beat the 6x6.8 variants @ 3500+fps, the only benefit of 6ARC is possibly better brass quality/supply.
Best brass for the ARC is to make it out of Lapua.....
Originally Posted By: DiRTY DOGMost ARC barrels are optimized for long bullets. But if you order a custom barrel you can easily change that. For an AR15, give Dtech a call and have them spin up a 10 or 12 twist for more versatility.
D-Tech does not have reamers for short bullets, so you're still handicapped by their chambers with long freebore.
I just went through this with my 6 Hagar. Their reamer was .117" freebore. I bought one online and sent it to Manson to be reground to zero freebore, then sent it to them to chamber my new barrel.
Too bad they don't order zero freebore reamers, and use a separate throating reamers for a true custom chamber for the customers.
However, their 22 DTI is one I can speak to as to having the perfect throating for lighter bullets. I can touch the lands with 52 Bergers, the only bullet I've shot in it.