I use Norma brass (but you may be able to get Hornady brass soon), Federal 215GM primers, and H4831sc in mine.

I've found (in my gun)that somewhere between 102gr and 106gr regulates well (approx 2030 fps) and fills the case to boot. IIRC, load data goes up to 113 gr but I doubt you'll get close to this without crossing.

I abhor wads/fillers/etc that are necessary with RL-15.

you'll likely need to get a big press like the Lee classic cast, and the Forster "big" case trimmer. Redding dies are $50-ish, RBCS thinks theirs are worth $250.

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