Not a ballistics expert, but I think I've got your answer!! Or at least I can provide you with a few formulas that relate linear velocity of rotation to the velocity of advance, and account for caliber and rifling, and get you going. The formulas are bit complex, my calculus isn't great, and the word processor I'm writing on can't handle math and scientific notation, so I'm not going to even attempt to display them with all the greek and subscripts, but you can find the formulas here:
Encyclopedia Britannica, 11th ed., vol. 14 pg. 133 sec 51.
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