9mm - anything pretty much as long as the case doesnt have a step in it, a mil crimp, and the flash hole is centered. Ive taken any brand of brass up into the +P territory with no issues. 95% range pickups.
45 ACP - anything providing its large primer as LP cases do get you a little more velocity and the flash hole is centered. SP brass gets culled and traded. 95% range pickups.
223 - LC for everything if I have a choice. Cases are strong and last even in a semi auto. No loss in case capacity, and they are consistent. And I can buy them by the 1000's if I want. I buy some LC for accuracy loads, the rest is range pickups. For blammo I load anything providing it still holds a primer and isnt split.
308 - LC for everything, full stop. Yes, Im giving up case capacity and a touch of velocity, but the cases are stronger, great for semi autos. If I wanted something fancy for a bolt gun only that Im neck sizing, Lapua probably. I give away any commercial brass I shoot or find. I own 2000 cases that I purchased, they are counted/sorted/tracked for times fired, and will be annealing these when I finish my annealer.
300 BO - I roll my own cases from LC. Once again, strong and consistent are the game here. All of this brass was once fired purchased LC.
Project guns in the next 3-36 months?
223 AI bolt gun - will fire form once fired LC.
6.5 Grendel - Im honestly not sure. Hornady brass is a little soft for extended use in an autoloader, and Lapua is crazy expensive.
458 SOCOM - Starline. Nobody else makes it, and Starline is some of the best.
357 Mag - Starline
300 (something) Mag - No idea
10mm - Starline