« Reply #4 on: September 06, 2022, 02:31:28 AM »
About all I can think of would be to check the firing pin tip protrusion at the bolt face. Should be about the thickness of a penny layed next to it with the back of the pin flush with the back of the bolt. Otherwise you may have a excess headspace problem where the shell can move forward slightly when struck by the firing pin which would mean the rim recess is cut slightly to deep.
jedman
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Current handi family, 24 ga./ 58 cal ,50-70, 45 smokeless MZ, 44 belted bodeen, 44 mag,.375 H&R (wildcat),375 Win.,357 max, .340 MF ( wildcat ), 8 mm Lebel, 8x57, .303 British, 270 x 57 R,(wildcat) 256 Win Mag, 2 x 243 Win,2 x 223 Rem. 7-30 Waters &20ga.,