Anyone here use them? I just bought a box,to try out of my Knight Disc Rifle,and have Triple 7 Powder on hand.But im hearing that Pyrodex P is more suitable to use with the big Conicals. Also at what Velocity does Leading of the Barrel become a problem.I was thinking of trying 70 Grains of T-7, ffg,up to 90 Grains.Will these powder charges,result in leading,out of a 26" Barrel,with these bullet's?.