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George, that half-grain is not a hard and fast number. If you read higher up, I specifically said that up to a 1% variation is essentially meaningless. I did give the example of a 50-grain charge in which a 15 Variation would amount to a half grain, but the real number to remember is the 1% one.
In the 308, with target loads, those guys are probably using charge weights in the 35-45 grain area. If they've found that .2 to .3 grains variation doesn't hurt their accuracy, that validates my point: those variations are just under 1%.
The comments about statistics are valid, too. A half-dozen three- or five-shot groups tells us nothing.
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