lesson learned. still got a few hundred left, but ill just shoot a few at a time in between some other ammo.
Don't mix brass and steel case ammo in the same shooting session without cleaning the chamber.
Why? After shooting steel cased ammo, your chamber will be fouled because the steel cased ammo doesn't expand and seal the chamber as well as brass cases.
Shooting a brass cased round after shooting a bunch of steel cased rounds that has fouled the chamber results in the brass cased round expanding against the fouling in the chamber and getting stuck.
I know this didn't happen in your case but I would go ahead and clean till the chamber till it shines.