I bought ten flats of AAs that my dealer brought back from this year's Grand. I've had at least one blooper, and sometimes as many as 3 bloopers, in every box from these flats!! I've gone through five flats so far, and there are defective shells in all five flats. My barrel has a bunch of "junk" in it after I shoot one of these shells. I assume it is unburned powder. The defective shells will break the target, but there is a marked change in recoil and the sound the shells make. The defective shells also appear to be slower. Ammo companies used to make special runs of the ammo they sold at the Grand in hopes of securing wins with their ammo. It would appear Winchester didn't pay much attention to their shells this year. I really like AAs, but I worry about using them for competition in the future. I just plan on using up this defective ammo for practice this winter.