If the round was able to move that far forward in the chamber you would probably run into no primer ignition or light strikes.
Headspace may be correct, but the chamber is obviously not. Possible that you have an issue with the extractor riding up past the rim and being levered away from the rim by the case body since it is a rebated rim.
You could probably replicate that with the bolt and a dummy round outside the rifle. See if the bolt face is milled too deep.
try putting a piece of scotch tape over the headstamp and see if it will still chamber
No, it will add a few thousandths to case length. If it closes you have excessive head space.
Yikes.
Do you have calipers? What do 4 strips of painters tape measure out to?
factory hornady 250g ftx ammo
High pressure causes brass to stick in the chamber and puts "belts" on brass.
Maybe try some Rem or Win. ?
Well, it is an AR. You're just lucky the extractor didn't pull the head off the case. That really sucks.
The bolt (extractor) is from Midwayusa?I think with the failure of the extractor to grab the rim, I’ll send the upper back.
curiosity got the best of me. 4 pieces of “unsquished” tape came to .061.
The bolt (extractor) is from Midwayusa?
http://www.450bushmaster.net/viewtopic.php?f=2&t=10673&start=40 page 5. View attachment 802049
The extractor position could be set back to deep in the bolt. There is a photo of that also.
View attachment 802050[/
I think you are going to have to reload for that rifle. Factory ammunition is way too hot for your chamber and barrel. And that is the bottom line, not some bogey man about case length or cartridge case protrusion. Whenever a factory new case looks like a belted magnum, after firing, that is a pressure problem.
View attachment 802102
View attachment 802103
The belt location reflects just how much of the case head sticks out of the chamber. If the case head did not protrude, you would have to use a ramrod to extract cases, because there would not be enough room for an extractor to grip the rim. You are lucky Stoner designed a particularly strong locking mechanism, for its weight, and that the case brass was good. Things would have ended up a lot worse had a case head blown.
View attachment 802104
I would call Hornady and fuss at them. Factory ammunition should not be causing these problems. Maybe you can convince them to send you 1000 primed cases, which you could then reload, with a reduced charge.
Slamfire,
You must have a collection of the most awful and alarming pictures of mayhem and kabooms of any THR poster on firearms and brass. Either you lead a very exciting life testing stuff to destruction or you have mad internet researching skillz.