I have 11 45acp handguns, but no M&P's. I use Fed. 230gr. Hydrashocks in all but 1, I use Silvertip 185 gr in it. This is so the ammo shoots to the sights. I expeirmented with about 15 types of PD ammo in 4 Handguns, and fount this consistancy and stuck with a good ammo that works in so many guns. The local Big CITY P.D. went to S&W 4506 several years ago and used the Fed. 230's, their rangemaster (my fil) retired and the newrange master went to SPEER, 3 of us tried the new loads and couldn't get that batch of ammo to group less than a foot at 25yds out of around20 45 autos, needless to say that is not an ammo I would carry. The Big City P.D. has gone to S&W M&P's now but I don't know which ammo they use. Ivan