My log indicates my Big Bore likes 38gr RL #7 under a 220gr Hornady bullet held in place by a moderate crimp. RCBS die crimped adequately for me. Never scoped the gun but accuracy seemed quite good, more than adequate for the close-up hunting work I bought it for. Eyes were much younger then.
Still have the rifle but it's an honest 98+% gun and value goes up every year.
WW factory ammo was a bit disappointing but don't recall any details. Reloading a good plan. Buy the brass while you can still find it!