Roskoe, before changing powders,would it make sense totry shooting the Keith bullets with 130 grains of Shockley and the Powerbelts with 100 grains? Better yet, shoot the Keiths at 110, 120, 130 and the Powerbelts at 120, 110, 100. Even if you only shoot one round at each charge it sounds like you could learn a lot about what the gun likes. Sure would be nice if you get it figured out at those prices!