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According to Quickload, that 170-grain bullet with 11.0 grains of AA1680 should be doing 1100fps with 20000psi chamber pressure at ignition, and 7000psi chamber pressure when the bullet reaches the pistol port. If I were you I might start off with loads that should be supersonic (like 13.0 grains) and work your way down carefully to make sure that you don't stick a bullet in the barrel. The lowest loads I've used were 20000psi initial chamber pressure, and I'm not sure I'd want to go any lower.
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