The hotter load gives more tactical penetration..or so they say.
Probably the issue load for Highway Patrol and State Police, that's
earned such a fantastic reputation for stopping power.
Double Tap's 125 gr. Bonded Defense (Gold Dot) uses the 6 petal
design at an advertised 1,450 fps out of a 4 inch barrel.
5 inch barrel is listed @ 1,525 fps. Most police issue guns for uniform
carry are the 4.9 inch Glock 31s.
The slower SPEER loads do have less recoil.