I load for 7.62x39, and IMR 4227 will work for it, but is too fast for 223 Rem, and too slow burning for 45 ACP. I would say that IMR 4227 is probably a better powder for 7.62x39 then 3031.
As Jeff said, typically you want to pick a powder that is suited for the caliber and bullet you are loading for. While many powders have a range of calibers and loads they will work for, usually you’ll find that one powder works really well in this load, but may only be mediocre in others. There’s nothing wrong with that per say.
I have a large collection of powders, and while this may seem worrisome to the new loader (mixing up powders) it can be managed, especially if you label what load it for on the canister.
Being someone who likes trying new things, having a large collection of powders is kind of nice.
Jay Andrew
www.theballisticassistant.com