Just got a new mec-gar 15 rd 9mm mag.,for my Browning Hi-Power & tried to fill it with winchester white box. I could only get about 9 or 10 in there then they jammed up. A couple of times I could only get 8 in there. I tried some USAAmmo & Hornady critical defense and they loaded fine. The wwb seemed like they were too long. Has anyone had a similar experience?