Perforated primers run with damaged firing pin(s). Every gun of mine that perfs, plus all I've examined at the club, showed pin damage at the time perfs were first noticed. Possibly, Cheddites give perforations prior to the development of pin damage. But I have yet to see it.
Conversely, I have seen damaged pins on guns that do not (yet) perforate Cheddites.
Cheddite anvils are longer than those on domestic primers. Don Rackley sets Perazzi firing pin protrusion in accordance with specified primer (ie., anvil length).
Having just replaced the pins on my P-stick, and needing to do same to the ASE, I'm done with Cheddites in those. Our 391s are immune, pins look brand new, so loads are segregated by primer.
Winchesters and STS are more expensive than Cheddites, but worth it IMO.
