Powders across calibers

[Rust]

I wanted to go a similar route when I first started loading rifle. I was hoping to use TAC as my go to rifle powder. Unfortunately my 223 groups half the size with H322 as it does with TAC, and my Grendel doesn't cycle very reliably with H322. It goes on from there. You might get lucky, or be able to find a couple powders that you can make acceptable blasting ammo with across the board. But if you're going to load for accuracy you're going to want to experiment with different powders for each gun.