? It's the same we've already been talking about in other threads. The SWC shoulder has to be out in front of the case mouth 0.020 to 0.040". Different guns use different distances, so some experimentation is required.
This distance is required becasue the SWC cartridge comes out of the mag, and the shoulder is what strikes the top of the chamber or hood. Then the cartridge gets knocked back down and in. Unlike other bullet shapes, the nose of the SWC bullet is really not involved in any of the feeding functions.
? On the 1911 guns in 45ACP, if varying the shoulder exposure length doesn't bring a quick cure,
then you need better mags. Cheap 1911's simply come with cheap mags. We don't have to worry about that with our CZ's becasue they come with
Mecgar mags, which are some of the very best. Remember that RN are always easy to feed; the worst case feed test of a mag is cartridges loaded with SWC.
You don't need to buy $50 mags. Get the
Metalform mags here. They are the OEM mag maker for
Colt Industries:
https://www.cdnnsports.com/magazines.html