I had an old Series 70 Colt that ran 100% with 1990s manufacture Wilson 8 rounders. the Colt was typical late 70s manufacture sloppy.

I had the gun completely redone and tighten up with a new barrel and slide to frame fit. the gun would not run with the Wilson anymore.

In fact, dug out the old Colt mags and it would run with them. Ended up with CMc Mags.

If your SW-SC is tighter than your SW1911.....the finickiness of the Wilson might be your issue.

I too agree that the Wilson I once had we weak sprung. I sold them and stick with CMc.

the feed lips may be too wide and the round dug into them.