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The answer was that they consider the powder to be too fast for that heavy of a bullet. By the time they got acceptable velocities, the pressure was too high
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This ties in with what I said. Even if you have a load that works, you have very little wiggle room for either safety or tuning. You are going to have 0.1 gr spread in your charge weights, even with a good measuring powder. In Clays you have about a .3 gr swing between a minimum power factor of 125 and a too high pressure of 35,000 psi. That gives you a velocity spread of 50 fps. With Power Pistol I make PF of 125 at 3.94 and reach 100% filled at 5.02 with pressure under 30,000 psi. A velocity spread of 852 fps to 1067 fps.
According to Quickload, a lighter bullet is even worse. with a 115 gr bullet you need a charge that is 0.05 gr under maximum pressure! No wiggle room at all.
Sell the Clays to someone that uses it and get something else.