bullet weights
I shot 230 gr slugs for many years, the majority through SIG P220's. Duty issue was best price and it always was either W-W Ranger or Federal Hydra-Shock. Qualification was with the issue JHP, but we shot 230 gr FMJ for training and practice, it was a bit cheaper and it was almost always W-W whitebox.
I loaded for my personally owned SIG, 230 gr LRN, shot it in IDPA and casually for recreation. When Hornady came out with the truncated 230 FMJ, I was a fan, 'cause Jeff Cooper said it was a better round than ball RN for GP and SD use, sort of a general purpose bullet. As the cast equivalents became available, I loaded and shot those too. The SIG fed all of them w/o complaint.
When I retired, I put the SIG on the shelf for the most part, bought a G21 and eventually an import 1911, a Tisas. I read the same material, that the 200 gr slug at 900fps was the original load, and I also read that Cooper endorsed a hot 200 gr LSWC in the early days prior good JHP evolution. I liked the sound of that. Lead slugs were taboo in the poly rifled Glock,and I have not shot it much anyhow. I'll admit though that its hi capacity of 14 big .45 ctgs is a great comfort if carried about. The Tisas was wide open for experimentation with conventional rifling, and I began to load and shoot 200 gr LSWC. To do so reliably, I needed Wilson mags and to pay much attention to OAL and crimping. I've about got it worked out, 1200 rds later, but the Tisas will burp on a LSWC often enough that I will not carry it as a SD load (it won't feed JHP or truncated with all mags either, ball runs fine).
But the 200 LSWC from about any supplier is wonderfully accurate, even in this budget pistol. Running 900 fps + with Unique or Bullseye, it is a serious load, but not unpleasant to shoot by any means. I just don't trust it to feed.
I wish I could find some of the Speer 200gr jacketed SWC to try in the Glock.
All that said, there is an outfit that is producing Coopers last ideas on a general purpose .45acp bullet, a sort of LSWC profile with sharp shoulder, but a more rounded, broader point. They weigh 200 grs and are plated, but are expensive. I'd like to try some in the Tisas.