AMM-406 - Ammo 9mm Federal Classic Hi-Shok 115 Grain +P+ JHP 50 Round Box Recommended for Law Enforcement It has a bunch of good reviews and I know the box says Federal but Cheaper Than Dirt is listed as the manufacturer. If it is good ammo, I'm going to order a box for my new M&P. I cant find any HP ammo around here. Places still sell out as soon as they get it in. I know it is +p+ and that is probably pushing the limits of what the gun can handle. For that reason, I am going to shoot 20 rounds at the range to make sure it functions and then the rest will be saved as carry only ammo.