Packmansion
Lil-Rokslider
- Joined
- Sep 24, 2022
- Messages
- 291
It's bullet length. 1:11 is good just about anything up to 160 grains for copper and it's good up to about 200 with lead. It's right on the edge for heavier bullets. Weather and elevation will play a role for heavy for caliber 1:11 twist especially with lead. If you're a fair weather mountain hunter (6000 elevation+) 1:11 poses no issues for almost any bullet you could image. Arguably you want to go lighter for copper anyway. The 1:11 will absolutely work. If you're a perfectionist like myself get a 1:10. I only care to shoot heavy for caliber stuff in a WSM otherwise why not just shoot 7mm? I built a semi custom Tikka 300 WSM with a 1:8 twist. I think we will start seeing 30 cal magnums with 1:9 and 1:8 more regularly with the 300 PRC on the scene.If you shoot factory ammo does it matter between 10:1 and 11:1?
Twist needs to be faster for longer bullets right? It has less to do with the mass (grain) and more to do with length and aspect ratio right?