M&P's are OK with lead.
G56 said:Lead bullets should work fine, but you have to be extremely careful with buying reloaded ammunition, there is a lot of junk out there, about 95%+ of what is available should be avoided. Personally the ONLY remanufactured (reloaded) ammo that I would even consider is Black Hills.
G56 said:Even when it's sold at a lot of different places, that doesn't necessarily mean it's any good, as an example, American Ammunition, aka Amerc, is probably some of the worst ammo you can buy, Amerc has probably KB'd more Glock 40's than any other ammo, but I don't think they do any reloading, only new ammo.
One good rule of thumb, NEVER buy reloaded ammo at a gun show, or any ammo that doesn't clearly show who made it, no zip lock bags etc.