I just fired 50 rounds of 124 gr HST today from my Shield 9 with disappointing results. When loading a magazine with the slide closed the first round would not feed. When loading a magazine with the slide open it worked fine. It looks like the nose of the round would tip down when hit by the slide. I tried extracting rounds from the magazine by hand and could not get the first one out without using a screw driver to hold the nose up. The nose of the round would hit the front of the magazine every time. Now I am worried. Is it the HST, the magazine, or the Shield?