From what I have read the BH209 will allow you to fire quite a few bullets without having to clean, the bullets can be pushed down the bore easily. Triple 7 is a sugar based powder and the inline primers causes the carbon buildup where the bullet is seated.
I have a Rem UL that uses triple 7 pellets and the "crud ring" near the bottom makes it darn near impossible to load the second bullet and a third is just about impossible.
