Someone gave me an older .58 huntsman the one with a O ring breach plug and <a href='/tags/11' rel='nofollow' title='See all tagged subjects with: #11'>#11</a> cap. I contacted H&R/NEF to get an owners manual and they sent me one for a newer .50 with 209 ignition and threaded breach plug. I fired a few prbs from it and it did ok but didn't go past 75 grns of powder. Can anyone tell me what is the twist is on these"looks like a slow twist" and what the max. powder rating is. I would think it should handle 120 grns but not sure enough to try it, and a prb or my shoulder probably wouldn't like it anyway. Also thought about buying a mold for it. Any experience shooting mines, maxis, or other. Cant hunt with it in Oregon "closed ignition" so its just a toy. Cant have enough toys. Ive read about the breach plug killing someone and the firing pin setting off the cap when you close the breach. Is this a real concern or more user error.