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Too bad the government ballistic experts in the early 1900's didn't think the 30 caliber service rifle's 10 inch twist barrels was too fast for best accuracy.
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Were they even looking for "best accuracy??" I don't think so. I think it was more likely a case of "this works well enough" and not a "we need to use the best"... also, I think, was the fact that "we already have these and make these, and we don't need to change anything (that costs money)
Remember that the Krag, the .30-03 and the original .30-06 were all used with heavier than 150gr bullets. When the 150s proved their value and became the general use bullet weight the twist stayed the same as they shot "well enough" for service use, and the heavier weights were still in service, too.