I finally got what I need to reload 45-70 for my new Perdosoli Trapdoor carbine. I'm loading 57gr of H335 pushing a 300gr Hornady HP. I can't find any other powder except some old IMR 4198. I'm not sure how old or the conditions under which it was stored. Here's my question. I'm getting a long narrow 12 inch fireball ball out the end of my 22 "barrel with the H335. I assume it's unburned powder that does not get burned as the projectile goes down the barrel. Please comment on the fireball and using the old IMR 4198 powder. thanks