45 ACP case size

Thank you group for telling me what the problem is. I missed the over-sized case head/rim completely.

The mystery to me is how you get enough pressure to do this on a 45ACP case? Expansion in the head area is usually considered a sign of excessive pressures. I have honestly never experienced anything like this on any case including rimmed and rimless cases.

Is this a common event that I have just never experienced or is it fairly rare?
 
The mystery to me is how you get enough pressure to do this on a 45ACP case? Expansion in the head area is usually considered a sign of excessive pressures. I have honestly never experienced anything like this on any case including rimmed and rimless cases.
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I think it is from the battering it gets when the slide chambers the rounds because while the rim seems to enlarge in diameter the primer pockets do not get loose...indicating it is not due to pressure.

Is this a common event that I have just never experienced or is it fairly rare?
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I can only speak in regard to 1911's. In that instance it is inevitable, will certainly happen with high reload, firing cycle counts on the brass. As I posted before, the battering from the breech face on the slide will virtually obliterate the headstamp over time...despite the fact that the brass will still be usable.
 
So I received the Lee Bulge Buster today. First round ok, second round stuck but good.

This is live ammo. Had to use a punch from the top to knock it back out. I was really scared it would explode.

Now I am afraid to use it again..
 
Jeryray -


In my experience in using the bulge buster, and I do so routinely, some cases do require a lot of pressure to force through the die. I have to bear down on the Rock Chucker with considerable force with some cases. But pass through they all do. It shows how some cases are in need of uniforming.

After passing through the die, they all fit flush and smoothly in the case gauge.

I typically run the cases through the bulge buster after they have been sized, and before they have been loaded. But I've run thousands of loaded rounds through this die as well.

Bayou
 
I have some rounds that are like this, they all pass the "plunk" test in my BBLs(5 different guns). If they plunk shoot them and don't worry about it.
 
I have some rounds that are like this, they all pass the "plunk" test in my BBLs(5 different guns). If they plunk shoot them and don't worry about it.
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Back in the old days, it was not a matter of the loaded cartridges not passing the "plunk" test...it was a matter of the the rims having grown too large to fit into the shell holder (single stage presses), and therefore could no longer be reloaded. I do not know if progressive presses that take shell plates are also so affected or not. While I still shoot .45 ACP and use a Dillon 550b, I do not do so as much .45 ACP as in the old days so I have not run into that problem as of late.
 
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