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in a .30 caliber rifle, 1:10 is a FASTER twist. translates to 1 twist in 10 inches. Therefore 1:12 is SLOWER.
The three bullets you mentioned should all work fine in a 1:10. THe M1 Garand and the M1A have 1:10 twist barrels (with the exception of some of the newer M1A's). The US military typically ran 150 and 173/175 grain bullets for the most part.
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