Having owned several .41 magnums and being old enough to remember and shoot the two commercial loads, the jacketed bullet load was very good for hunting, but the problem with the "police" load was that it was still way to hot (read, muzzle blast and recoil), for self-defense and police use. If they had toned down the police load (a soft lead, gas checked bullet), a little more, it may have generated more interest by police.
In early 1974 my original duty gun, a M28-2 S&W, was developing problems from a year of steady DA practice with Magnum hand loads. I found a 4" M-57 for a good price and started carrying that instead. The Remington factory police load was terrible. Way too hot (over 1000 fps) and leaded something awful. I came up with hand loads which I carried but was not able to find dump pouches for anything but 38/357. Speed loaders were still in development stage at that point and not for the 41 Mag cartridge. I was not at all satisfied with just a belt slide ammo carrier. In April of that year I got off probation and qualified with a Colt MKIV Series 70 Government Model. Never looked back at the revolver for law enforcement, except when I trained deputies and corrections officers shooting revolvers.
I later played with a M-58 and a Blackhawk 4-5/8" 41 but they were just toys at that point. They too went away as I was concentrating on competitive shooting with the 1911.
Dave