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I read an article in which they tested bullets of .355", .356", and .357" through a .38 Super pistol.
The original purpose was to determine if there was a correlation between diameter and accuracy, but what they discovered was a stronger correlation between bullet bearing surface length and accuracy.
The longer the cylindrical portion of the bullet, the more accurate they tended to be, regardless of diameter. That would suggest that heavier bullets are more accurate, but I've shot some 147s that had a very long, tapering profile, with a shorter bearing surface than lighter bullets with a stubbier profile.
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