Interesting, I have seen your posts before about this rifle. My son has one in .58 . He has taken several white tail deer with it, I don't remember his load but he uses a .575 ball. Did you just deepen the hammer cups? Do you remember what the twist was? The new ones are being made for SLUGS!!! The .50 and .54 have a 24 inch twist and the .58 has a 48 inch twist, They are for the hunters that think you need HUGE slugs to kill game!!!! LOL!!