Gents, First post here. Before I start, I have spent several hours reading post relating to 10mm heavy ammo and posts relating to Glock FTE issues. I have not come across any that seem to tackle my specific question. If I have missed something a polite redirect would be appreciated. I have a G20c 3rd Gen. Compensated factory barrel. I bought the gun with the purpose of being able to shoot heavy (200 - 230 gr) loads for black bear/woods defense while mountain biking/hiking. Before anyone suggests it, a revolver is not my choice, I accually traded a Model 29 .44 mag for the G20c. In short, love the gun, grip fits my hand perfectly, love the big grip, stupidly accurate, recoil is super manageable, quickly becoming my favorite gun to shoot. It eats any and almost all ammo from standard 180gr American Eagle FMJ, to Win. Silver Tips, to Glaser/Cor Bon Safety Slugs, without a single failure of any kind. The problem comes when I shoot Buffalo Bore 200 gr FMJ FN (1200 FPS) rounds, Item # 21A/20. The first box I had 5 FTE's out of 20, the second box I had 1 out of 20. Not exactly reliable enough to bet my life on. I contacted BB, but they basically said that the rounds shoot fine from their G20, so they can't help. They were not rude, but not exactly helpful. I will post some pictures of the last failure and hope folks can offer up some suggestions. Since it shoots everything else fine, my first thought is to put a stiffer spring in it. This is the the first full sized Glock I have owned, the others have had compound springs, but the slide does feel fairely easy to rack. I am wondering is the slide is coming full open then starting to close before the case has had a chance to eject, then gets hammered by the slide. Another question/clue is that besides the striker pin impression on the primer, there is a square "counter impression", wonder if this is normal for the G20, or another clue? Thanks Guys.