But now we're so far off-topic, who cares.
"Who cares", difficult jobs? Most difficult, helping someone that does not care.
There was something you said I thought was rather rude and or snarky. Then there are those that can not believe this thread is still going. To talk to someone at Hornady about the firing pin and primer it will be necessary to find someone that understands extractors and receiver designs.
I know, it sounds cute: "The firing pin strikes the primer and then everything takes off for the front of the chamber". Never has anyone mentioned the .7854rule. The .7854 rule applies to my firing pins, again, my firing pins are killers on primers.
About 5 years ago I sent a Model 70 Winchester back to Winchester, there was no one there that understood the chamber in the rifle I purchased had a large/ugly chamber. It was the ugliest I had ever seen, they suggested I shoot it more. And I ask: "How will shooting it more make the chamber smaller? I suggested they send me a set of dies that would fit their chamber, I need a large ungly set of dies, and they did not understand. I took the rifle to their warranty shop, someone I know. He said he was going to hone, polish and ream the chamber, to WHAT? a 300 Weatherby Mag? No, the chamber could not be cleaned up with the Weatherby die.
they sent the rifle back in a new box.
I decided I would start on the rifle again, problem, the extractor would not jump the rim of the case, Point? If the extractor jumps the rim there is no way the firing pins is going to drive the case forward to the shoulder of the chamber. I know, it sounds cute, the firing pin drives the bullet, case and powder forward to the shoulder of the chamber and then! the primer is crushed. I do not have time for the case to travel all the way to the front of the chamber before the primer goes off, I want things to get busy, I want it to start as soon as I pull the trigger.
F. Guffey