Leaky Waders
Member
Bushmaster Bolt Carrier Group Top, Bravo Company Bolt Carrier Group bottom.
The 1:7 being the best spin is very debatable...again if you're shooting longer bullets, then you want 1:7. If you look at 'the chart' you'll find half of the manufacturers use 1:9 twist. My abolt and remington bolt action 223 have 1:12 twist (I'm pretty sure). If you're reloading then it might be neat to have some variety of twist to help with certain bullets.
The 1:7 being the best spin is very debatable...again if you're shooting longer bullets, then you want 1:7. If you look at 'the chart' you'll find half of the manufacturers use 1:9 twist. My abolt and remington bolt action 223 have 1:12 twist (I'm pretty sure). If you're reloading then it might be neat to have some variety of twist to help with certain bullets.