With heave bullets 180 to 220 gr 1:10 seams to work best. Temperature and low bullet speeds will cause stability issues with some 1:12 barrels. This is because of air density and low spin rates on longer heavy bullets
If you are shooting 150 to 165 gr bullets then a 1:12 should work just fine but so will a 1:10 or 1:11.
I have a very fine 308 with a 1:12 twist rate and it is very finicky with 180 gr and heaver bullets. All of my 1:10 barrels show no signs of this condition.
Kevin
If you are shooting 150 to 165 gr bullets then a 1:12 should work just fine but so will a 1:10 or 1:11.
I have a very fine 308 with a 1:12 twist rate and it is very finicky with 180 gr and heaver bullets. All of my 1:10 barrels show no signs of this condition.
Kevin
