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A 1:8" twist will stabilize the 75-77 bullets, so a 7 twist is not "necessary".
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Most high power shooter shoot 80 - 90 grn bullets at 600 & 1000 yards, so yes a 1:7 is necessary.
When in doubt always go heavier or faster twist. A 1:7 will shoot lighter bullets but a faster twist will not shoot heavier bullets. This chart shows the compairson.
