I can attest to the value of the dome shape camming out of primer strike indent. I put new pins in a Lightning Trap and shot a round of skeet without measuring the protrusion hammers down. There were very slight drag marks on the hull base but the gun wasn't particularly hard to open and no pierced primers altho the indent appeared very deep. Afterwards I measured the hgt and they were well above the Arnold service manual spec. Ground down to spec and reshaped and polished. No drag marks and no misfires afterwards so apparently I can follow instructions if sometimes belatedly.
jack
