In a grendel couldn't tell you. In .223 I can tell you with a 80gr bullet or heavier I prefer faster than a 1:8 twist as I have experienced destabilization when pushing the projectile past 3000fps. This has lead me to a thought of math vs reality.
My experience shows a difference, yet I shoot with guys who are successful. The only difference is the barrel manufacturer, so there is where the question arises. Am I REALLY 1:8 or is it slower.... or is theirs really 1:8 and is really faster?
I came up with 2 solutions and ran them both. I switched barrels to a krieger 1:7.7 and issue went away.
I slowed down to 2900fps and issue went away.
Comparing the results of the 2 contrasting by effort and cost, simply adjusting my load was a far more efficient solution. The extra 100fps gained me nearly nothing on target, well within error of shooter.
What did I learn? If I'm asking the question of 1:7 vs 1:8 just stop. Spend more time in load development, going the other route will put an unnecessary dent in your wallet that you would be far happier with putting towards an optic.
My experience shows a difference, yet I shoot with guys who are successful. The only difference is the barrel manufacturer, so there is where the question arises. Am I REALLY 1:8 or is it slower.... or is theirs really 1:8 and is really faster?
I came up with 2 solutions and ran them both. I switched barrels to a krieger 1:7.7 and issue went away.
I slowed down to 2900fps and issue went away.
Comparing the results of the 2 contrasting by effort and cost, simply adjusting my load was a far more efficient solution. The extra 100fps gained me nearly nothing on target, well within error of shooter.
What did I learn? If I'm asking the question of 1:7 vs 1:8 just stop. Spend more time in load development, going the other route will put an unnecessary dent in your wallet that you would be far happier with putting towards an optic.