It's not got anything to do with weight. It's the length of the bullet. Just so happens that the longer bullet in any given caliber is heavier.... ..usually. Look up greenhills formula.
1 in 8 will work with 70 grainers, and the long 105 amax if you fancy trying some longer range shooting too. It may reduce velocity of your normal loads by a few fps, but I wouldn't lose any sleep over it
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