At those velocities, the 1:10 should not be an issue. Looks to me like the 100NP is your go to bullet.
I have a 1:10 .243 that groups 100NP tightly for three shots. Never tried five because I figure two is about max for hunting. I have not had bullet issues with them.
Best wishes,
Jack
"Do not blame Caesar, blame the people...who have...rejoiced in their loss of freedom....Blame the people who hail him when he speaks of the 'new, wonderful, good, society'...to mean ,..living fatly at the expense of the industrious." Cicero
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