As others have said could be the OAL of the cartridge or not enough powder charge possibly??
I have a Para-Ordanance P14-45 stock barrel,I cast and shoot a 200 gr. swc with 6 grs. of Unique for target loads with cartridge OAL of 1.255.When I first tried loading the 200 gr. swc with lymann's OAL for the 200 gr. swc of I believe 1.135? Nothin' but stovepipe city at 1.135!
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