All my 1911s are totally reliable with hardball ammo or 95-100% power reloads with Round Nose Plated, Jacketed or Lead projectiles.
I also use Colt, Mecgar, McCormick, Ruger, Kimber and Norinco magazines with absolutely no failures to Feed.
The 1911 reputation for unreliable functioning comes, I think, from people who tinker with them without prior understsanding of how the pistol works. As well as shooting ammo with heads other than RN, RN hardball, like SWCs or TCs. As well as shooting pipsqueek loads to barely make 125 PF.
Tightness or looseness has nothing to do with reliability IMO.
My Springfield Armory is bank fault tight in all respects. Kimber Target has a tiny amount of side play between slide and frame, Ruger SR1911 has more side play and a bit of vertical, and the Norinco Sport has the most play. But they are all tight with regard to barrel to slide fit. I'd trust they will be reliable if reasonably cleaned and lubed.
I once ran a Remington based pin-gun with Clarke barrel and compensator, 700 rounds in about 2 hours. This piece was so tight all around that it took about 1,000 rounds to smooth everything out and achieve the reliability needed for competition. Two stoppages at approximately 300 and 500, which were fixed without cleaning but with a generous spray of WD40...yes I learned later that WD40 is not a lube. All the shoots I ever competed in never went more than 200 rounds. So stoppage intervals of 200 to 300, totally filthy, was not an issue for me. Ammo was weaker than regular hardball too.
If the question is with regard to reliability after dunking the pistol in a bucket of sand then mud, run over by a truck and finally dropped from 100 feet, sorry can't answer that.