In the 120-130-ish grain weights, Hodgdon lists BL-C(2) powders for all three. In the lighter bullet weights, 108-110-ish, Hodgdon lists Benchmark as well. You could probably work up a load using Benchmark for 124-ish grain 30-30 loads.own shoot and been collecting brass for 7.62x39, 7.62x54r and now .30-30.
reloading gurus, is there a multi purpose 124 -ish grain bullet that would work across all three cartridges? and powder since they’re all centerfire rifle?
Of course, you could use Hodgdon's Trail Boss powder. They have a simple formula for working up safe loads for pretty much any rifle cartridge. The short version is that max charge for the cartridge is 100% case fill right up to the maximum seating depth of whatever bullet you're using (no compressed loads). Starting load is 70% (by weight) of the max load.
I've been loading for my father's 100+ year old antique Winchester 30-30 using Trail Boss.
Peace favor your sword,