Hi realmswalker,
Yes - close-up images showing feed ramp area, and views showing the opening of chamber.
As we see, the Cartridge is being caught and bitten by a sharp edge there, at the Chamber entrance area, as it enters at an angle ( which it must)...just as RC mentions....in fact, that is a nasty little 'bite' there.
Possibly the Chamber entrance of the Breech had a finishing-step overlooked by the Factory.
Given these are re-loads, I had the thought also, for you to check both the diameter of the Bullets, and, of the Case Neck once Loaded, to see that these are appropriate to spec for .45 Auto, and, not too 'fat'...but, probably that is not what is at play here.
Another simple test, with a definitely clean, no-excess-lube on it Cartridge, would be to remove the Extractor, remove Firing Pin, remove the Magazine, and, holding the Pistol on it's side sort of, see if it will chamber a round introduced by hand in an already aligned way...just to see if the Slide will chamber it alright, when the cartridge is headed in with little to no angle as it would when coming from the Magazine...or, see if it thumbs in alright, with the Slide locked 'back'.
Or, dis-assemble the Pistol, and, with the Barrel removed and on it's own, just see how a thumbed-in Round seems to fit.
Then see if it fall out when the Pistol ( or Barrel ) is elevated, or, if it needs a long Pencil to push it out.
May be a tight Chamber also, in addition to the sharp ridge which is doing the 'bite' on the Cartridge Case side...