magnums
My agency went from the "Treasury Load", a hot .38spl +P+ 110 JHP, to actual magnum ammo, with 125 mag as standard, and 110's as a sort of secondary standard. Some folks found the 125 hard to shoot well, and the 110 mags were a bit milder in the 2-1/2 inch M66's and M19's which were pretty common off duty and admin type guns.
We had trouble with the "Treasury Load" being consistent. Different lots could be very mild. And its performance in 2-3 successive shootings was dismal. The 110 mags were the real thing, and I'd guess they easily made 1200 fps from 4" bbls. And 125's were serious medicine.
From a Marlin carbine, the 110's did not give good accuracy. Mag 125's were explosive.
Within just a few years of going to mags, the auto pistol wave struck.