I shoot low pressure 7/8 with PB powder at 1150 fps with Remington cases. I believe the pressure is lower than black powder at the same velocity and feel this load is one of the reasons the gun has held up so well. When I got the gun it was a wreck so I restocked it , did the barrel work and shoot it all the time, usually 6 to 8 rounds of skeet and 1 round of sporting clays per week. Wall thickness is .047 by the way. If it does'nt have external hammers I have no use for it. : Bonehill