What if the firing pin strike sets the shoulder back .006"
The same member that started that silly saying about the firing pin driving the case forward to the shoulder of the chamber is the same person that made up the story about the firing pin shortening the case from the shoulder to the case head. I said I had killer firing pins, I said my firing pins crush the primer before the case, powder and bullet know their little buddy, the primer, has been crushed. So what did he do? He made up the story about shortening the case.
I gave an example that turned members snarky, most members get snarky when they do not have a clue. I gave them an example: I chambered a short case in a rifle with a long chamber meaning there was .127" clearance between the shoulder of the case and shoulder of the chamber. (I could say; "think about it" but I believe it would be a waste of time)
Members are conditioned to relate case head separation to clearance, because? They love one liners, your post is a perfect example. Back to the example; I chambered the short case with .127" clearance aimed and then pulled the trigger. I then ejected a case with a very short neck, the shoulder on the case was almost erased when it became part of the case body and the part that reloaders can not understand, most of the neck became part of the shoulder. Again, I could suggest someone think about it; The shoulder on my case did not move.
243winxb, you are leaving out too much information, another example; I received a call from a shooting range. Seems all the shooters were down on R-P ammo, I told them to get the phone number off of the box and call Remington. Later that day a shooter shows up with a box of 30/06 R-P ammo with 5 fail to fire rounds and 15 that did fire. The primers looked like they had been hit with my firing pins because they were crushed. The shooter made 2 attempts at fire the rounds, he then passed them around to anyone with a 30/06 rifle. Meaning there were 3 additional rifles at the range and each one of them had an opportunity to bust the rounds off and for those keeping up the primers were struck at least 6 times.
What effect did the firing pin strikes have on the length of the case from the shoulder to the case head? None, the 5 failed to fire cases were the same as minimum length/full length sized, new out of the factory box cases. I pulled the ammo down to the components, I was impressed with the cases, powder bullets etc, I removed the (live) primers, nothing missing, I then installed the primers back into the same cases they were removed from and then dug out one of my old M1917 Eddystone rifles with a killer firing pins then chambered the case with the primer/no bullet/no powder and pulled the trigger. I busted the primers one by one. After busting the primers I measured the length of the, the case did not get shorter, the firing pin did not drive the case forward to the shoulder.
As much trouble as reloaders have understand the shoulder and sizing as in 'bumping the shoulder back/moving' it does not surprise me they have even more trouble understanding what happens to the shoulder when fired.
Another example; a friend built 4 magnificent rifles, he made the reamer. After he finished he called and said he had a problem, he had 5 case head separations out of the first 10 rounds fired. I informed him I could have told him that would happen while he was building the rifle, I informed him I could have fixed the problem at his shop before he left for the range, I informed him I could have met him at the range and fixed the problem long enough for him to fire form his cases.
Anyhow the member that started the story left out so much information I find it difficult to understand why anyone took him seriously, and here you are repeating the same old silly story.
I could ask about the parts of the story he left out, problem no one can answer the question with a one liner, there is always cut and paste.
