I misplaced my reloading notes for 30 carbine in a move long ago. But I could only get a couple reloads without trimming. They were also very sensitive to primer protrusion but that was due to bad brass. I loaded reduced amounts of 296. I do not remember the warnings about not shooting reduced loads of 296, but they are there now so I will not mention the loads.
The 30 carbine Blackhawk is an attention getter at the range, nice and loud. Like "OH MY G....WHAT WAS THAT?!?!?!" at an indoor range