04-04-2016, 04:30 AM
Twist rate, mostly on .30 bores. The 270 WSM factory guns normally have a 1/10", as does the 270 Winchester, so they are spun fast.
Some of the .338 LM rifles even have a 12 twist, and will come apart at around 1500-1600yds with some of the longer projectiles. Put a 1/10 in them and they can extend. Ulfberht uses a 1/9.3" twist.
Put a 1/9" twist in a 16" .308 and you will have better reach than a 26" .308 with a 1/12". Within 800yds, the 26" 1/12" will spank the 16" all day long, but then come apart as you push out. Some guns are more forgiving than others, maybe due to slightly tighter bores, but fast twist is the way to go.
Some of the .338 LM rifles even have a 12 twist, and will come apart at around 1500-1600yds with some of the longer projectiles. Put a 1/10 in them and they can extend. Ulfberht uses a 1/9.3" twist.
Put a 1/9" twist in a 16" .308 and you will have better reach than a 26" .308 with a 1/12". Within 800yds, the 26" 1/12" will spank the 16" all day long, but then come apart as you push out. Some guns are more forgiving than others, maybe due to slightly tighter bores, but fast twist is the way to go.
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com