223 rolled shoulder when chambering

[JoshIronshaft]

Not sure how else to describe this...



This happened today, in my 16" barrel AR. The same thing happened in my 11.5" suppressed AR. They look identical. Both times the action was frozen out of battery and I had to "mortar" the rifle to open it (grab charging handle, slam stock against knee, inertia opens action) so it took some force.

The one pictures is from the first incident that I had the state of mind to save. It's Wolf Gold 223 brass that I'm guessing is once fired since it's kind of new to the market but it might not be, I picked it up at the range after a carbine class this past fall.

I do not have the piece of brass from the incident today, because I got annoyed and chucked it in the woods at the range. I realized my mistake as soon as it left my hand lol. I might go look for it if it really matters.

I've loaded a couple thousand rounds with no issue, but recently I switched from full length sizing and depriming (Lee die) and trimming (Dillon rapid trim with full length outside sizing die) in two separate single stage presses to combining them on a tool head with nothing else on my Dillon 650 press. I have the full length resizing die backed off just a touch at the advice of a friend so as to not overwork the brass and the rapid trim die is set to finish.

I checked the die settings with a dillon case gauge.

I haven't touched my Lee bullet seating die or my Lee crimp die for about 3000 rounds.

I'm not sure if this is a brass issue or if I have something set up wrong with my dies.

[Stooperzero]

Gotta bring the seating die down to meet the shell holder when it's in the UP position then adjust the seating knob .




I did it today too making dummies for my madsen.

[M&P Chris]

That's interesting. It almost looks like way too much crimping.

[JoshIronshaft]

Gotta bring the seating die down to meet the shell holder when it's in the UP position then adjust the seating knob .




I did it today too making dummies for my madsen.

Can you explain this some more?

[Stooperzero]

with no case in. pull your ram/arm down so the shell holder comes up.



it should just barely make contact with your seating die.

[JoshIronshaft]

I understand that, but what is the root cause of the problem here

[Lycanthrope]

It looks like the brass is folding when the crimp is coming in. You just want to bump the brass with the FCD.


Lycanmybetthrope

[dkf]

If he is using the Lee FCD to crimp then that is not buckling the case. The FCD for .223 uses a collet which squeezes the neck to crimp so there is not downward pressure like with a taper crimp die.

Any marks on the bullet from the round taking a nose dive into the feed ramps? You can get an idea about how much crimp you have by measuring the neck a few places on a finished round. The area at the crimp should be slightly smaller in diameter than the rest of the neck.

I adjust my sizing dies to touch the shell holder and remove any slop in the head when at full stroke. You need to insure the shoulder is set back far enough.

[JoshIronshaft]

The bullet is not set back at all so it doesn't seem like it hit anything. This is advice I'm on THR and it is being confirmed multiple times:

Too much crimp in the seating die adjustment.
Plus, you did not inspect them as closely as you think you did.

There is nothing going on inside the rifle that can do that to a round.

It buckled in the seating die due to a long case getting excess crimp.
And you didn't catch it during final inspection.

There is no other possible explanation.

[markshere2]

I've done that a few times and caught it at the loading bench.

REadjust your dies and you will be fine.