I wish manufacturers still offered 223 and 22-250 in a 1:12 twist. It makes no sense when almost all the hunting ammo for 223 and 22-250 comes in 50 to 55 grain projectiles and almost all the gun manufacturers make make 22-250 in a 1:14 or 223 in 1:9. Fortunately I do own an older CZ in 223 with 1:12 twist, it shoots 40 to 55 grain under 3/4” consistently, in some ammo 1/2” groups. I have had people type back, “ I have a 1:7 twist that gets moa” or “it’s funny how some people don’t know how to shoot”. I just disregard those. I have experienced in 223 in 1:9, 1:8 and 1:7. In 22-250 I have tried several 1:14 none of them have produced moa or better at 100 yards. I have tried multiple ammo manufacturers in both 223 and 22-250. I just wish they would bring back the 1:12 twist in a hunting rifle for 223 and 22-250. Why do people think you have to fix something that is not broken.
The faster the twist rate the more spin drift you get down range. Over spinning a bullet can be a problem at long range because it can cause the bullet to spin itself apart (jacket separation) and disintegrate before reaching the target. It's best consult the bullet manufacture to determine the maximum RPM of the bullet and stay at or below that. The faster you push a bullet the less twist rate you will need. Twist rate and bullet speed are closely connected. The slower the bullet the more twist you need, the faster the bullet then you'll need less twist.
I wish manufacturers still offered 223 and 22-250 in a 1:12 twist. It makes no sense when almost all the hunting ammo for 223 and 22-250 comes in 50 to 55 grain projectiles and almost all the gun manufacturers make make 22-250 in a 1:14 or 223 in 1:9. Fortunately I do own an older CZ in 223 with 1:12 twist, it shoots 40 to 55 grain under 3/4” consistently, in some ammo 1/2” groups. I have had people type back, “ I have a 1:7 twist that gets moa” or “it’s funny how some people don’t know how to shoot”. I just disregard those. I have experienced in 223 in 1:9, 1:8 and 1:7. In 22-250 I have tried several 1:14 none of them have produced moa or better at 100 yards. I have tried multiple ammo manufacturers in both 223 and 22-250. I just wish they would bring back the 1:12 twist in a hunting rifle for 223 and 22-250. Why do people think you have to fix something that is not broken.
The faster the twist rate the more spin drift you get down range. Over spinning a bullet can be a problem at long range because it can cause the bullet to spin itself apart (jacket separation) and disintegrate before reaching the target. It's best consult the bullet manufacture to determine the maximum RPM of the bullet and stay at or below that. The faster you push a bullet the less twist rate you will need. Twist rate and bullet speed are closely connected. The slower the bullet the more twist you need, the faster the bullet then you'll need less twist.
I had a 22-250 ackley that loved to vaporize some heavy bullets !
What twist did you decide on for the 208’s in your 308?
1-8 twist. It was custom made by Krieger. Super fun to shoot at distance. Was slow, less than 2500fps but the BC more than made up for it.