If you do not want to excessively dirty up the innards, I would recommend you avoid UMC bulk ammo (yellow box).
I would also recommend (and this is my opinion and mine alone) that you similarly avoid steel-cased ammo, especially varnished steel-cased ammo, for two reasons: the steel is harder than brass or nickel, and could conceivably lead to accelerated wear on the extractor claw, and also when fired, an amount of the varnish vaporizes, contaminates the rest of the gun, then recongeals. I have had experiences trying to clear out AR-15 gas systems so contaminated with burnt varnish from steel-cased Russian ammo that it was easier to replace the gas block and gas tube. I know, rifles vs pistols, but the same effect of vaporized varnish applies regardless.
I have also been told by one other Forum Member of his experience with an aluminum case that stuck in the chamber after firing, and froze the slide. He eventually had to contact Glock for assistance in removing the stuck case. I have personally not experienced this, but relate his experience in the hopes it may help.
Now, all that being said, WELCOME TO THE FORUM, Las4wo!
If you could post a *Hi there* in the "Introductions" category, other Members will have a chance to say Hi back at ya.
Cheers!