I can think of a Kimber 10mm (which I still own) which was fussy about what magazines it would like. Then I polished the extractor hook, and tuned the tension. That seemed to fix it, though it needs more testing.
My Sistema wants nothing to do with hollow point ammo, in limited testing. You might get half a magazine to feed, but it clearly doesn't like the stuff. There's a S70 Colt Combat Commander that I have not shot much, as it is nickel plated and unmodified. IIRC it is generally pretty good, but I purposely don't shoot it much. Both guns are collectible and won't be modified.
The Les Baer does not like weak ammo. I tried some commercial 230gr FMJ a year or so ago, and the LB choked on them. Then I realized the bullets were setting back in feeding, and decided the pistol was jut trying to tell me the ammo was bad
It works perfect with full-tilt defense loads, or +P loads.
Out of 20+ 1911's most worked fine with their intended ammo. The ones that didn't sometimes needed tuning, different ammo, or different mags to run right.
The only one that was useless crap was an AMT hardballer, which once jammed so tight I had to beat it apart with a hammer. A couple of Colts from the bad days of the mid-1980's had significant issues, yet were either fixable or would work fine with certain ammo/mags.
