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While we were still in San Diego, we picked up 500 rds of the Wolf 9mm in lacquered steel cases. My wife had her Sig 225 (a police turn-in) that she wanted to use for a self defense class where 300 rds would be expended. The Wolf ammo was jamming the 225. I discovered shavings of shellac building in the slide. That box of Wolf was relegated to use in her Ruger PC9. It works perfectly there. For her 225, I found some 124 gr FMJ and enough brass to load up for her class. Before doing the full run, I built multiple loads and identified just the right combo to drop the brass at her feet with the 124 gr. She completed the class with no jams and a relatively clean pistol. I was using Win 236 for that run.

The only Wolf ammo I buy right now is the 100 gr 6.5 Grendel. I had one bad round with a split steel case in my CZ 527. It was very hard to get the case out of the chamber. I would use only brass for the 6.5 Grendel if I could find it.

Although your mileage may vary....

A friend went through famous defense training classes, 1 week of intense training, hundreds of rounds or more spent. I specifically asked him which hand guns and which ammo had problems. He said most all of the down and out guns had been running steel cased ammo. He also said he would never run steel ammo in anything but firearms made for it that have used it for decades(i.e. AK and variants).

That’s good to know. Sigs usually digest everything. My go to.38 Super is a P220, you can mix any ammo in the mag and it runs. The Colts I’ve had were picky.