I had a .50 Scout carbine, 21" barrel, and a .54 Scout rifle, 24" barrel. I never had any ignition issues with them. If I remember, I had used Goex, Pyrodex, and American Pioneer in them, and ignition was good. However, they were both erratic shooters. I tried all powder/projectile combinations, and could never get consistant groups. I have owned many T/C MZ's, and these, along with .50 caliber White Mountain Carbines, ( .54 White Mountain group well with patched round ball) were always inconsistant shooters. I gave them to my nephew, who expressed interest in them. Also, there was a flat spring under the receiver that broke. I called T/C and they mailed a new one to me. The T/C tech. told me that it was common for that spring to break, because every time you slide the receiver cover off, it flexes that spring, and eventually it will break.