Use a stuck case puller, available from Brownells

CY6
Greg Sullivan "Sully"
SLR15 Rifles
TheDefensiveEdge.com
(763) 712-0123

Have run steel coated wolf ammo through full auto rigs by the cases per events, without problems and not break down cleanings alone the way.  Hence the upper bearing areas get a little fresh amount of CLP around every 250 round,  and all is good.

The only difference with steel case ammo is that is has a polyurethane coating on the steel cases to keep them from rusting, which means as the cases are cycled in and out of the chamber, small amounts of polyurethane is going to get scrapped off, which turns into a powderized fouling instead.

So standard government side wall width chambers (read a touch looser), and just re-introducing small amounts of CLP around every 250 rounds through the carrier exhaust channels into the gas chamber of it (carrier pulled back just enough to get the gas rings forward of the ports so it can be flowed through the gas ports to get to the back carrier sections) and this new migrating CLP is enough to prevent the poly powderized fouling from building up and choking the rifle out (fouling just flushed away).

But since we may not be talking a standard military looser side wall chamber, but one that may be on the tighter cross way side, or even the chamber walls not mirror smooth, lack of fresh CLP lube more frequently, and the poly powderized fouling is going to build up to the point to choke the rifle out.   Hence the poly powderized does not burnt to the chamber walls, but instead just gets packed to the chamber walls to build up over time is not flushed away via fresh solvent,  and since CLP does not dissolve polyurethane, once it gets to that level from not being flushed as it trying to build up isntead (small amounts of CLP on the cases from the action migrating into the chamber each round to flush the powderized fouling away), then you at a point that such fouling this bad has to be chamber brush scrubbed out isntead.

So it not the steel case ammo over-all the problem in it self, since I have seen brass case ammo that burns so dirty it can do the same thing if one is not re-lubing the rifle correctly, but the lack of keeping the upper receiver bearing areas lubed during the long shot sessions isntead.

Nope, the steel used to make steel case ammo is really soft, and at 55k of working pressure, it seals to the chamber wall just as well as brass case ammo.
Fact it, the steel is so soft, it actual more playable than say a older brass surplus ammo cases that may have become brittle instead.

So the glitch is the polyurethane coating that is not as slick as polished brass case ammo, and it has a higher grip force to the chamber wall during the extraction instead.  Combine this with the powderized poly fouling scrapped off the cases that may be in the chambers as well, and now the more grip to the chamber wall during residual pressure during the extraction has become worse.  Lastly, on the cheaper steel case ammo, the cheaper value gun powder used in the loads to keep the price down on  it, burns very, very dirty, so it not just the steel case with coating, the powderized poly fouling, but the burnt gun powder fouling as well that is causing problems.

Point blank, just about every goverment has used steel case ammo, including the US goverment during times of war, so precaution have been instilled into the operators manuals so such can be run through the rig and not cause problems with the added fouling build up.

Fact is, in regards to the M-16, although it was not a steel case problem, but Win re-cycling  gun power to use in the loads (burned dirty as hell due to the CC in it), The military instilled the same process that was used for Steel case ammo to solve the problem with that Non-ball ammo, during  at what the time the government thought was a gun that did not need to be cleaned as often/lubed as much isntead.  Hence not only issuing a cleaning manuels that the troops would would read, cleaning supplies they could use (since a lot of rifles where issued without a cleaning kit),  but changing out the solvent use to clean and lube the rig from LSA, to CLP shortly after as well.

Cleaning comic book that was issued.
https://www.ar15.com/archive/topic.html?b=3&f=7&t=354791

So the problem is not the steel case ammo, but the operators using it not using the correct solvents and cleaning methods to run it in the rigs isntead.
Note, over the decade I have been a mod on the site, the same can be even said for opts using brass case ammo as well.
Hence had I had my way, every AR sold to the public new or used, would come with USGI cleaning comic book, a spray can of BreakfreeCLP, a bottle of Sweets, and and extra chamber brush taped to the rifle (second one in the cleaning kit in the butt stock or taped to the rifle as well) with a huge note on the rifle to clean and lube it correctly before it's fired even the first time.

Chambers produced on the tighter sides (cross wall dimensions),  less than mirror smooth chamber wall conditions, then both coupled with the fact that the chambers are left in the storage protective grease state to prevent rusting before the rigs are sold (and the debris that such will collect) fired without cleaning such before hand (the whole chamber brush and CLP by hand thing).

So even thought a new rifle may come with an owner manual, and even a cleaning kit that has both a chamber brush and a small bottle for CLP in it, the rig is not first cleaned before being fired to fully remove the storage grease (and the debris that is collected), and most of the time, just some sort of oil (not CLP) may be used to just be sloshed around in the rifle, and it first fired this way instead.   Hell here, it a 50/50 chance if its even going to run with brass case ammo if the chamber is mirror smooth and not cross wall reamed on the tighter side to begin with, and the odds drop way down with the poly coated brass case ammo isntead.