I bought Remingtons to try with mine and then Saturday bought some Winchesters. Just firing the primer, the Rems seem dirtier inside the barrel but clean on the back of the breech and the firing pin. The Wins seem to leave more crud outside the back of the breech plug and around the firing pin but are cleaner inside the barrel. I also noticed last night while firing a couple to make sure the barrel was dry that the Wins don't seem to throw out sparks while the Rems do. The accuracy doesn't seem affected by either. The pyrodex fires and the bullet comes out the end, I can handle a little extra clean up I guess.