Very interesting and enjoyable discussion. I prefer the integrally ramped barrels for the Super, but haven't used a comp. Using ramped barrels, 124/125 grain bullets at 1450 FPS or so, and 147 at 1250 FPS or so were easily achieved. Nothing to indicate any issues using AA-9 and AA-7 powders, and mostly new Starline Super Comp, along with some 38 TJ cases.
Years ago, I did some experimenting with Col. Cooper's Super 9/"Super Cooper" cartridge, .223 cases trimmed to .900". I'm not sure I was aware of of integrally ramped barrels for 1911s, or if they were even available back then. Using a 5" unramped barrel, no comp, I got to 115 grains at 1625 FPS. No blown primers, caseheads, etc., but I decided that was as far as I cared to go
Years ago, I did some experimenting with Col. Cooper's Super 9/"Super Cooper" cartridge, .223 cases trimmed to .900". I'm not sure I was aware of of integrally ramped barrels for 1911s, or if they were even available back then. Using a 5" unramped barrel, no comp, I got to 115 grains at 1625 FPS. No blown primers, caseheads, etc., but I decided that was as far as I cared to go