1 in 16"
Your Winchester model 70 bolt action rifle that is chambered in .300 Win Mag,has a twist rate of 1 in 10.
What I have found is its 1-10" for 308.
6mm Remington twist rate is 1 in 9, 244 Remington twist rate is 1 in 12. The 1 in 12 twist will not stabilize long 100 grain bullets while the 1 in 9 twist will.When the the caliber .224 Remington's name was changed to 6mm Remington, the twist rate was changed.
The twist rate in a Winchester 670, 243 caliber is 1:10.
Them twist rate of a Winchester model 70 rifle in .223 Rem.is 1"in 9".
It will vary with caliber.
twist is 1:9
1:10
1 in 10
9.5
1 in 9"