Robert,
What are you planning on launching them out of? Reason I ask is I've got a 30-06 with a Krieger 1:10 that I shoot 230gr Bergers out of with no problems.
If you're going with a 308 it might be needed, but anything faster I don't think the 1:10 will hinder you in any way.
-Dan
The 240 SMK out of a 300 RUM 10 twist will shoot well until about 1500 yards and then they won't stay on a basketball court hence the 9 twist recommendation from Seirra.
