I have some 158gr SWC cast bullets I'd like to try in the KKM barrel for my G34, but I'm not sure where to start with load data. They can't be loaded to a long OAL, and still fit the chamber, so I know I'm working with a much reduced case volume. I have made up some dummy rounds, and they do feed from the magazines at a pretty short OAL.
I have Universal Clays, W231, and AA#7 on hand. These would be strictly a plinking load... no need to hit a PF, as long as they cycle the gun.
I've loaded 147's plenty, and I'm tempted to try 2.5-3.0gr of UC to start with, as I think both W231 and #7 are not ideal for this heavy bullet. Anyone else have any suggestions?