I made my first trip to the pistol range with my HK 45 today. The local stores didn't have the white box Winchester JHP's I usually shoot to break in a new gun, so I purchased Blazer ammo/CCI. The HK 45 is as accurate as advertised right out of the case; it was a pleasure to shoot overall. I shot a box of 50 Blazer ball 230 grains, 20 Winchester PDX1 Supreme Elites (personal defense jhp's), and a box of 50 230 grain ball ammo the range had on hand; it was from an ammo company in Edmond, Ok. (recommended by the range staff). My main issues were when I initially shot the first 10 rounds of Blazer, the last round would not feed; I then noticed that the magazine was partially released. This occured a few times as I fired with the magazines at capacity (10) using different ammo and the mags partially loaded to try and determine what was occuring. I readjusted my hand position a few times in an attempt to solve the problem. I shot a total of 120 rounds and had the magazine release prior to being empty about half the time. I do have large hands so I'm not sure if I have to practice a better firing position as to not prematurely release the magazine. The HK 45 didnt seem to like the Blazer ammo as much as it did the Winchester personal defense 230 grain JHP's., which it fired and ejected without a problem. Do I have a magazine release problem? Or do I need to adjust my hands as to not release the mags by accident? BTW, I also shot my Glock 30 and it was very accurate with the same ammo I shot with the HK 45....no issues at all. Until I figure out what is occuring with the HK, I will keep my G30 close by. Please help me solve this. Thanks in advance.