Thousands of rounds of Challenger shells fired by myself and members of local and surrounding clubs and no issues spoken of pierced primers. I’ve fired them in semi autos and both Browning and Guerrini O/U and no issues .
Like the shells and will continue to shoot them.
Likewise, have reloaded thousands of shells with Cheddite primers in AA hulls with no issue.
Suggest you have a issue with your gun and those components rather than bashing Chedditte and Challenger.
You best get up to speed on this one. Even cheddite admitted to dimensional & material issues with their first runs of primers here in the early 2000's and once installed they were protruding higher than other makes
Google cheddite primers piercing and read the pages and pages
Want some problems . I think there is still 5000 faulty ones here in one of my lockers dated like 2004 or so that will help you see it
Cheers
I bet none of yours look like theses
Here is the explaination I remember at the time
The issue with Cheddite primers is centered on two areas: Thickness of the metal in the actual cap, and our application of these primers to mostly classic guns. i.e.:
The cap metal is thinner than any other 209 primer and they rest high when seated
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 . But they are not so good in a Parker hammer gun or K32.