If one of the rifles is a Garand, pick a powder for that first, and the powder selection is important. (I think the NRA published a reloading guide for the Garand, and there are several good powders to choose from) Whatever works in the Garand will probably kinda work for everything, but you'll want one or two other powders too; a faster one and maybe a slower one.
Your first post said you're looking for 2 or 3 powders; that's the right target
I said Varget earlier, but I think it's just a
little too slow to work well in the Garand; not sure but I think it hammers the op rod too much.