I've shot 600 rounds through my .40 Tactical since I've had it, and only shoot WWB & UMC through it at the range. I just went to the range this weekend and had FTE every 3 rounds consitently when shooting WWB. After switching to UMC it was flawless like it always has been. I use to have feeding problems when the gun was new but that was do to the magazines being so stiff. Does anyone have any suggestions about what is my prob. Should I open up the mag lips a bit? The shell was not stuck in the pipe. The slide would just stay back (not locked back) and the next round in the mag would be holding the slide back while the spent casing was left in the pipe. I would just drop the mag and rack the slide to get the casing out but this was scary to me as this has never happened before & I just started to carry it.