Remember that Rossi chambers their '92 in 454 Casull. I shoot Ruger-level 45 Colt/ 300 grain loads in my Rossi carbine with fine accuracy. (Both my 45 Colt and 357 Magnum Rossi like heavy-for-caliber bullets, BTW.) The actions are quite strong, and a book load with 300-310 grain bullets should do no harm. It's not likely that you'll enjoy shooting a whole lot of them, however...