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What is the thinking on this? I see that the GAP 6.5 SAUM is 8.5 or 8.75 twist. I'm building a .260 and found a Bartlein barrel #3 contour 1:8" twist, any reason not to jump on it? Will be using 120-140 gr bullets.
What is the thinking on this? I see that the GAP 6.5 SAUM is 8.5 or 8.75 twist. I'm building a .260 and found a Bartlein barrel #3 contour 1:8" twist, any reason not to jump on it? Will be using 120-140 gr bullets.
I have 2 6.5 SAUMS, one is 8.5 the other is 8.75.. They both shoot fantastic. I have (2) 8 twist 6.5x47's and (2) soon to have (3) 8.5 twist 6.5x47's.. They shoot all 6.5mm bullets equally as well as the other... A friend of mine has a 9 twist 6.5x47L and he shoots 139 Scenars into one ragged hole..
8.5 is enough, but many use 8tw because the "faster is better" mentality is hard to overcome. I use 8.5 for 260s and creedmoors unless customer requests otherwise
I get one ragged hole with 6.5 x 47 with a 8.5 twist and same ragged hole with my 8 twist. Ain't gonna make a difference if you hand load and carefully tune.
Because less twist (provided you are certainly stabilizing the projectile) has several advantages, most notably - less inaccuracy due to bullet imbalance.
The 6.5 SAUM achieves way WAY more than enough speed to get very ample stability factors, even with an 8.75+ twist barrel.
There is no particularly good reason to use more twist than is necessary.
Generally you see 1:8 for like 6.5x47 or 6.5 Creed at the speeds they can send a 140gr, then in my range (modern 6.5 Swede) I can easily get away with 1:8.5 due too my 3000fps velocity, then when you're entering 6.5 SAUM territory 8.75 is no problem.