Terry Brady
Member
What would be the best twist for a bullet weighing from 140 sierra,s to maybe 147 C. River grain bullet?
6.5 Twist
- Thread starter Terry Brady
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chris matthews
Well-Known Member
Need 1-8 twist.
Steve Shelp
Well-Known Member
Terry,
I've fired Sierra 142s MK, Sierra 140s MK, Lapua 139s, and Hornady 140gr A-Maxs through 2 seperate 9" twist barrels without a problem. And the one barrel did a whole bunch of winning at 1K BR matches. Haven't fired them in extreme cold weather though. About 30-40F is the lowest temp I've fired them in.
The 140gr Sierra in a 9" twist is good as low of temperature as you can stand. I've fired them with snow on the ground and the temp was %%^$%^ cold without a problem.
The Clinch River 147s work great in 8" and 8.5" twists by actual firing and hopefully will get to try them in my good 9 twist barrel this weekend. But it's going to be close according to calculations. We'll see.
Steve
I've fired Sierra 142s MK, Sierra 140s MK, Lapua 139s, and Hornady 140gr A-Maxs through 2 seperate 9" twist barrels without a problem. And the one barrel did a whole bunch of winning at 1K BR matches. Haven't fired them in extreme cold weather though. About 30-40F is the lowest temp I've fired them in.
The 140gr Sierra in a 9" twist is good as low of temperature as you can stand. I've fired them with snow on the ground and the temp was %%^$%^ cold without a problem.
The Clinch River 147s work great in 8" and 8.5" twists by actual firing and hopefully will get to try them in my good 9 twist barrel this weekend. But it's going to be close according to calculations. We'll see.
Steve
mbianchini
Well-Known Member
my 6.5 WSM's got 9" twist and the 6.5x284's got 8" twist.
What velocity are u going to drive the C-Rivers?
[ 11-05-2003: Message edited by: mbianchini ]
What velocity are u going to drive the C-Rivers?
[ 11-05-2003: Message edited by: mbianchini ]
I've got a three groove Pac-Nor barrel chambered for 264 Win. Mag. with an 8" twist. Shoots the 140 SMK's great at just over 3000 fps. Not the most efficient cartridge in the world, but the dies were only $40. How many rounds of 6.5-284 would I have to fire in order to save $200 in powder to cover the extra expense of the dies????
That's my story and I'm stickin to it!!!!!!
That's my story and I'm stickin to it!!!!!!
ottsixx
Active Member
8:1 twist rate
zigliss
Well-Known Member
Another vote for 1:8. I have just had a custom 260 rem completed with a 1:8 twist specifically to handle the heavier bullets.
