Just got back from the range. Shot about 70 rounds and had 4 jams. They were towards the end or the last round I think in each case. The round was jammed nose up and the only way to clear was pull out the mag. Is this common? Is there anything I can do or will it break in? I shot winchester, Sellier Beloit and federal AE. 3 of the jams were Fed AE and one was Win. Thanks.