Again the great caliber debate. When I started we could only carry .38spl and we could only carry Colt or S&W guns. Eventually, firearms training opened up to Ruger's. We argued for semi autos for years. Too much training they said. Too easily to jam they said. Eventually the powers approved semi autos. You had to qualify 3x with it on the range before you could carry it. 9mm was the first approved cal. Easy to control, penetration, etc. .45's were banned because of their at the time SAO triggers. Semis that were approved had to be DA/SA or DAO. Not too many DAO at the time. Glock was banned because of too light a trigger pull. Eventually they authorized .45....the problem my Department has, is that they have the officer buy the gun and they stock everything from .380 to .45.....off duty carry is limited to at least .380 (not for on duty) so the budget for ammo is outrageous. I think they would have been better selecting one gun, writing a contract for that gun, providing it upon hire, charging the officer for it (so he/she would own it) and providing one type ammo. I actually like the 9mm, because I feel its easiest to control, accurate and has ok stopping power if the hits are in vital areas.....I would guess that the .40 would be chosen as the best compromise between control and stopping power...just a guess.....