Three Powders
You can use one powder for the 308, 8mm, and 30-30 and get excellent results for all three. Hodgdon's BLC-2 would be about perfect. The Swede will give better performance with a slower burning powder. Of course, you will need a pistol powder for the 45. No, there is not an ideal powder for all 30 calibers. A 30-30 is just way too different from a 300 magnum. You didn't mention which bullet weights you intended to use. I suggest you use a mil-spec primer for the M14. Other than that, I prefer CCI and Federal primers, and for pistols I use a lot of Winchester WLP primers depending on which powder I choose.
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