When I first bought the M&P22, I started with a box of the Winchester 525 packs of 36 gr ammo. These seemed to work OK with very few problems. Out of the 525, I had very few FTE or FTF problems. That didn't seem too bad, so I bought a 2,100-round bulk pack of the same. This batch is not going too well...I'm still on the first 525 box of this batch, and I'm getting anywhere from 1-3 FTE/FTF's in a 12-round magazine. I have 5 of these magazines, and it seems rare that I go through at least one magazine without any FTE or FTF problems. I'd sell what I have of the Winchester remaining, but there just isn't any .22LR anywhere to replace it with. I did pick up two packs of CCI 40 gr mini-mags at a gun show yesterday, but that was the limit...by the time I went back to try and get two more, they were all gone.