In reply to post #19

The twist rate was one of the more difficult decisions. Since I’ll be shooting cast bullets in the range of 150 to 170 grains at a range of 100 yards, I opted to go with a 1 in 12 twist. I almost went with a 1 in 10. However, the twist rate formulas I used for the bullets and velocities I expect kept pointing to the 1 in 12.

Also, if a 1 in 12 was good for the people who originally designed the 30-30 Winchester and the 30 Remington it should be good enough for me. If I was going to shoot bullets in the range of 180 to 220 grains I probably would have gone with the 1 in 10.
Right now I have a Krieger #4 contour CM barrel .300/.308 with a 1 in 12 twist waiting for the chambering reamer to arrive.