This past weekend i was muzzleloader hunting. Before going out, we stopped at the range to fire a few test rounds. For the first round I poured the powder (Pyrodex) in my barrel and then put a 320gr maxi hunter bullet in. While pushing the bullet down, i heard a sizzle and a whisp of smoke came out of the barrel, the bullet was only about a 8" down. Scared the heck out of me, so I pulled it apart, dumped the powder, and removed the bullet. I then cleaned the barrel and tried it again. No smoke this time, but I'm pretty sure I heard the same sizzle when the bullet was halfway down. I continued and seated the bullet, and it fired just fine. I seem to recall this same issue happening several years ago. The only thing I can think is that there was a particle of powder stuck to the barrel and the friction of pushing the bullet down ignited that small piece. Anyone ever had this happen, what the heck is going on?