Amazing how prescient some of you guys are!
Young shooter, new gun, he still has the rest of the box of PMC ammo. What? None of you have ever heard of overcharged PMC rounds? Where have you been for the last decade - living on an island?
Personally, I prefer to believe that the OP is telling the truth; and, I won't suspect reloads until someone shows me otherwise. Geeze, what a tough audience!