100% this. Be on the lookout and grab brass whenever you can. I have a 18in SAUM and absolutely love it. For longer barrel heavy bullets, RL26 seems to be one of the more sought after powders. For shorter barrels, I've had good luck with 4831SC and 150 Bergers.I'd stock up on brass and components before I sunk a dime into a 7 SAUM build at this point. Great cartridge if you can feed it.