I've got a 30-.284 wildcat 99. In looking up loads I found some info in the old PO Ackley books, 51 grains of powder with a 180 gr. Started at 48 grains and stuck that cartridge in the gun on the first shot! Hotter en hell!
Started over at 43 grains (down from published 51 grains) and had to drop it yet again.
I'm at 42 grains and ready to try again.
Wonder what kind of pressure 51 grains ran at? LOL
My old man's got a 30-284 he built from an Arisaka. I don't remember what he was loading for it, but I DO remember it having quite a bark when you pull the trigger. Seems like a pretty hot cartridge for a 99, since ballistically it's similar to 30-06.
