Hi, all. I've been reloading for most of this year, both 9mm and .45acp. The loads are now consistent and accurate. Unfortunately, my 9's cause an occasional problem. About once or twice out of 100 rounds fired, the slide fails to go into battery. I don't mean the kind where a gentle push on the slide seats it. I mean where I have to "thwack" the rear of the slide on a hard object (pointing downrange, of course!). Thus, I really don't think it's a recoil spring issue. If I remove that round before whacking it into place, and put it into another mag (or even the same mag), it goes without a hitch. My 9mm rounds are loaded to 1.165", with a 0.344" crimp (same as WWB, which works fine). I'm using 124gr. fmj over 6.0gr. of Power Pistol. The rounds drop into the chamber. Any thoughts?