I converted an SR1911 to .45 Super, and one of the "problems" that immediately surfaced was primers that appeared to have been sheared by the firing pin hole.


Same load, different FP and spring
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I saw that the primer was flowing back into firing pin hole, so weighed the firing pin. It was significantly lighter than a steel FP, so I replaced it with Wilson "bulletproof" pin and an extra strength spring. Problem was solved. A little more tweaking of mainspring weight and primers appeared normal. Pressure was not excessive, velocity is in order for a .45 Super, and ejection is about 6 to 8 feet, less with a comp.

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