I'm beginning to wonder if the bulk boxes of any brand ammo have issues. I just got my 15-22 and started off using the federal bulk box as recommended by S&W. Stove pipes approx 10% of time. Switched to CCI Blazer bulk, same issue. Purchases CCI Mini Mags, in a box that protected each round a little better. No issues. To rule out a faulty mag. Tried all three in a friends 10-22. Stovepipes approx 1 - 5% of the time. Mini Mags - No issues. I know that Mini Mags have a little more power to cycle the bolt but this seems like more than just a coincidence. Needless to say, switching to the mini mags. If it starts to have issues again, I'm sending it into Smith for the Miracle Adjustments referenced here.