I made the mistake of shooting some 426 grain Buffalo Bullet conicals one time out of the T/C Renegade .54 caliber and stuck 110 grains of Pyrodex Select under that. Renegades are a great rifle but the stock design will bite you in the cheek bone if the recoil is strong. I walked around for three days with a sore face from that one...

I did the same thing. I dropped them to 80 grains..