You'll have to shoot it to see what it shoots best. 1:7" twist is designed for the heaviest .224" bullets, which it obviously will stabilize. It may fragment lightweight frangible bullets like Sierra Blitz and Hornady SPSX.
Anyone shot the 64gr Speer Gold Dots LE in there 1 in 7 yet? I have some of those and some 75gr and was hoping the 64's aint to light.
Those bullets won't be too light. It's a bigger, well-constructed bullet. It won't fragment. It will stabilize in a 1:9 twist, but over-rotating a bullet only matters to bench rest shooters. Go try some and find out if your gun likes them.
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