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Old February 4, 2013, 04:57 PM   #15
Senior Member
Join Date: January 15, 2011
Location: Deep South
Posts: 162
No, a 1:9 twist rate is best suited for lighter grain ammo. 55gr max really.
This is not correct. I have a 1:9 that I've shot up to 70gr with good result.

The bottom table shows max bullet weight per twist rate. Look at .224 column.
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