The Win 1911, as was the Browning A-5, were Long Recoil operated arms. On these the bolt & barrel, locked together, recoil to the end of their cycle together. The bolt is held the barrel unlocked to go back forward at which point the bolt is released to come forward, picking up a fresh shell on the way.
I will probably miss a few but full & semi autos have been made on the long recoil, short recoil, gas, blow back, delayed blow back, blow forward, primer actuated & a few others I can't recall off hand. Julian Hatcher in Hatcher's notebook covers most of them.
When powder is ignited in a closed container it gives equal pressure in all directions. For a cartridge case to stay in the chamber with no support certain criteria must be met. The case must expand & grip the chamber walls tight enough to resist the backward thrust. There is absolutely no doubt this thrust exists. Also the construction of the case must be stout enough the case head will not separate & be Blown Off.
Anyone is of course free to do as they please, but personally want my guns constructed on the premise they must be able to resist a considerable Back thrust from the case on firing. Over the years there have been too many cracked frames, oo many guns declared to have breeching too weak to handle heavier loads for me to believe otherwise. Among shotguns the 1893 Win & early Marlin pumps come to mind & among rifles the "Trapdoor" Springfield & toggle link Winchesters. The barrels on these were not declared unsuitable but the bolt support was.
