As far as carry guns go in 9mm, +P seems to be what most people use although there are heavier 147gr. options that seem to still perform in short barrels. It's almost impossible to avoid shooting your defense ammo through your guns since you'll want to shoot enough at the range to make sure it functions in your particular pistols, and then a few times or at least once a year when you cycle out the old rounds for a new set.

Either way, very few modern day handguns are not able to take a few boxes a year of +P ammo. The M&P Shield shouldn't be a problem and if you couldn't shoot it through a particular firearm, a good manufacture would state so in the manual. I personally use HST 124gr.+P ammo in my carry guns and wouldn't carry a gun that couldn't handle at least a box or two worth a year.