The issue with Cheddite primers seems to be centered on two areas: Thickness of the metal in the actual cap, and our application of these primers to classic guns. i.e.:
The cap metal is thinner than any other primer I've tried.
The guns that we shoot are old and equipped with firing pins that are the proper length and tip shape for ammunition that is no longer made. This old ammo had primers seated deeper than today's cartridges, hence a longer protrusion was necessary. Also, some older firing pin tips are more conical than rounded.
Add all of this together and you get a "draw" on the cap that it cannot withstand. It will often pierce. Especially under pressure.
Cheddites might be fine in your Remington 1100 or K-80. They are not so good in a Parker hammer gun.
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