Went to qualify for my PD with my XD45. Brought S40 along for company. Temperature was about 100 degrees. After everyone was done, started shooting the S. At first everything went pretty smooth, then started getting strange FTFs - round is pointing down in the magazine at about 20 degree angle, slide locked back. If you pull the slide back, it chambers with no problems. That was with Winchester White Box. About every 2 or 3 rounds you'd get that FTF. Someone told me that they are notoriously underpowered and cause these kinds of malfunctions. Just to prove the point, I put in couple GoldDots and functioned without any issues. This happened with all 3 magazines, and also happened with the XD earlier (only once or twice). So here's possible causes: 1. Sweaty hands - limp-wristing it due to excessive moisture 2. Ammo issues - White Box 3. Combination of 1 and 2. Has anyone had this issue before? Any info appreciated.