9mm has been an exercise in frustration for me. All the 356 diameter lead bullets fired through my CZ went through the target sideways, ie keyholing. Once a sage individual suggested a 358 mold designed for the 38 Special, all those issues cleared up (358-125-rf Lee mold).
However, I have to use a minimum powder charge as the boolit has to be seated very deep in the case.
45acp is absurdly easier to load for than the 9mm IMO.
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