Rare Failure Or Not?, it stopped the gun from running

[MistWolf]

I'll add that severe over gassing will increase the frequency of blown primers significantly.

I believe it's one of those issues with 3 contributing factors - hot ammo, tight chamber and over gassing.

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I had a 16" 223 Wylde middy barrel with an .093" gas port.

Can't remember, but probably had an H2 buffer in it at the time.

It would not run steel case ammo at all, kept ripping the rims off and not extracting.

Brass 223 like PRVI ran ok

XM193 would blow primers left and right.

Got some jammed up under the trigger too.

Sounds like a real POS barrel, eh?

After dropping the gas port down to .073/.076", that same barrel will run everything.

IMI M193, CBC 62 gr ball, Prvi 75,wolf 55, MFS 55, you name it.




Blown primers are not Normal and not OK.

One or more of those 3 factors may be present and should be corrected before continuing.

I'm well aware that blown primers are not normal and not safe. What I am asking is what chambers shooters are having problems with to see if there is data to support a trend.

How does over-gassing contribute to blown primers?

[Clint]

I know you know Mist; The strong advice was for the OP.

The barrel in my story was a Wylde. It does seem to show slightly more pressure signs than true 5.56 chambers, but nothing to worry about.

Not exactly sure, but I suspect the early extraction leaves the primer partially unsupported while still under some amount of pressure.

I'm well aware that blown primers are not normal and not safe. What I am asking is what chambers shooters are having problems with to see if there is data to support a trend.

How does over-gassing contribute to blown primers?

[MistWolf]

I know you know Mist; The strong advice was for the OP.

The barrel in my story was a Wylde. It does seem to show slightly more pressure signs than true 5.56 chambers, but nothing to worry about.

Not exactly sure, but I suspect the early extraction leaves the primer partially unsupported while still under some amount of pressure.

Ok, I gotcha

[Ned Christiansen]

I have recovered primerless empties at the "scene" of a popped primer incident. Tolerance on the primer pocket diameter is .1738 / .1745. I have measured some of these as large as .180, so it's no wonder the primers fall out upon extraction!