Well honestly i dont know. i'm not a gunsmith, i just was making an observation based on what i read and experienced for myself. if hammer inertia is an issue, then the hammer extentions we need to use, because of scope clearance issues isnt helping that situation either. but like Tim points out, poor chambers are an issue. but the way i have been reading it, hammer strike and firing pin issues are more frequent then poor chambers, at best its an combination of these problems, to the point where NEF decided aginst continued production. even if they did continue production of the whelen, tightened up their manufacturing of the chambers, they'd still have to adress remingtons ( at least ) hard primers issues. hard primer are used on calibers where auto,semi-auto, pump or lever action rifles employ rounds that are pointed on the end, we know this , to prevent mishaps, so should NEF.
They replace barrels or entire rifles, where the chamber is faulty, and fix the hammer strike where its at fault, as they did my mine.
for guys that can reload, this issue is fixable by custom rolling to match the chambers. for guys like me, i was lucky it was a hammer issue, that can be modified well, enough to allow me to shoot factory ammo. not an ideal situation, but its workable. course, i 'd be taking a different tone , had i not been able to get my fixed and working..
Glenn