bullet stuck in chamber

[NKD]

Here’s what happens:
Steel case doesn’t fireform to chamber walls. After ignition and pressure spike, it springs back to its smaller size, allowing gas and crap back into chamber along the chamber walls.
Chamber gets dirty and gets grabby on case. Then, extractor claw rips off part of rim. And case stays stuck.
This can be exacerbated by an overgassed gun, as the cycle is a bit more violent.
Also a rough chamber can make the dirty chamber even more grabby.

After firing a string and getting gun hot: if you then pause a minute with a live round in chamber, this can then lead to that round being fired and case retained.

Just my non-expert opinion based on my experience with steel case.

 

[Desolo]

Here’s what happens:
Steel case doesn’t fireform to chamber walls. After ignition and pressure spike, it springs back to its smaller size, allowing gas and crap back into chamber along the chamber walls.
Chamber gets dirty and gets grabby on case. Then, extractor claw rips off part of rim. And case stays stuck.
This can be exacerbated by an overgassed gun, as the cycle is a bit more violent.
Also a rough chamber can make the dirty chamber even more grabby.

After firing a string and getting gun hot: if you then pause a minute with a live round in chamber, this can then lead to that round being fired and case retained.

Just my non-expert opinion based on my experience with steel case.

word to the wise..... try not to shoot brass case in a rifle you have shot a ton of steel case in before clearing the chamber... the carbon will "glue" a brass case that expands into the chamber walls pretty badly if its got enough carbon build up.... But, that takes a while to get it THAT dirty.

I'm convinced that is what made people decide that "lacquer" coated ammo was bad for AR's. they insist it is the lacquer turning into glue with heat, but its the steel springing and the carbon sneaking into the chamber.

I think that phenomena is at its worst with cartridges that have little taper, and in guns that have less robust extraction. i.e. an AR in 5.56mm will be most likely to experience that vs an AK in 7.62x39 due to the distinct case taper AND its case extraction being good at dealing with it.... and interestingly enough MOST fluted chamber roller delay guns (G3's HK93's etc) seem to do GREAT with steel case (assuming they are running correctly and do not have undersized chambers) BECAUSE they are already doing exactly what the steel case in a regular chamber is doing anyway, but the gas is allowed to flow around the case via the flutes regardless of case material.

 

[NKD]

word to the wise..... try not to shoot brass case in a rifle you have shot a ton of steel case in before clearing the chamber... the carbon will "glue" a brass case that expands into the chamber walls pretty badly if its got enough carbon build up.... But, that takes a while to get it THAT dirty.

I'm convinced that is what made people decide that "lacquer" coated ammo was bad for AR's. they insist it is the lacquer turning into glue with heat, but its the steel springing and the carbon sneaking into the chamber.

I think that phenomena is at its worst with cartridges that have little taper, and in guns that have less robust extraction. i.e. an AR in 5.56mm will be most likely to experience that vs an AK in 7.62x39 due to the distinct case taper AND its case extraction being good at dealing with it.... and interestingly enough MOST fluted chamber roller delay guns (G3's HK93's etc) seem to do GREAT with steel case (assuming they are running correctly and do not have undersized chambers) BECAUSE they are already doing exactly what the steel case in a regular chamber is doing anyway, but the gas is allowed to flow around the case via the flutes regardless of case material.

Truth. I still hear about the lacquer from people, lol.