Fabs,
Actually it is the bullet lenth and not weight that you set twist to, but since we are usually talking of lead bullets the longer they are the heaver they are, in the same cal. But if your compairing a copper bullet to a lead bullet in the same weight the copper bullet will be much longer. And yes the longer, heaver the bullet the faster you have to spin it to get it to stableize.
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Catfish
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