Quote:
If you could have just one powder for loading these;
30-30
300 Savage
30-06
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Which end of the performance spectrum are you willing to "go short" on?
All the IMR powders from 3031 through 4350 are useable, also W748 and 760 and many others. For highest speeds in the 06, the slower powders are better (4350/760) For best efficiency in the smaller cases the faster powders are better (3031/748) and the middle ranges 4064, 4320, 4895 do it all pretty well, though not quite as well at the extreme ends of the spectrum.
All of them will produce good hunting loads in the normal velocity ranges in all the listed cases. SO, any of them you can get in sufficient quantity for your needs would do.
I found I got IMR 4895 more than others because I use it to duplicate the military loads in milsurp rifles calibers I have, as well as work well for others.