10-23-2017, 04:42 PM
StoneHendge Wrote:While I let this marinate, I gave McGowen a call this morning with a few ?s.
- bolt face depth? Send us your bolt an we'll headspace it
- can you do an R+2 gas system? Sure can!
Anyone see a downside to R+2 with a 26"? Seems like it should be the way to go - bullet will still have 12" of barrel past the port.
1:8 twist seems the way to go for heavier bullets (they can do as fast as 1:7 and as slow as 1:14. The only other question would be 4 or 5 groove rifling - well above my pay grade! I know there's an eternal debate on accuracy, but 4 groove should theoretically allow for a tad more velocity, right?
I know Sierra recommends a 1:7.5 twist for the epic bad ass 110 SMK. FWIW my 22" 6mm Creedmoor with a 1:7.7 twist stabilized them just fine at 2950fps.