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I used to care about such things. Then I had a world record holding bench rest shooter tell me he did not give a flip about them and I should not either. I started following his advice. Take a known accurate powder and charge weight. Jam it into the lands and shoot a 5 shot test string. Back it up .02 and shoot a test group. Keep backing it up until the group gets better or worse. As long as it is getting better, keep going. When it gets worse, head the other way in .01 increments. When you get the most accurate length, then start playing with powder.
As a side note of caution, dont jam a Weatherby in the lands. Its a whole different creature.
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