Finally got out and patterned my mossberg 535. Two things arose while patterning it. 1. My pattern is shooting high. I have a fixed front sight, and the rear sight is adjusted as low as it will go. What else can I do besides aim low. 2. When I shoot, the chamber of the gun comes open. It opens almost enough to eject the shell, but not quite. It did that every time, and yes it was closed all the way. It is a pump gun. Is this something I should worry about and what can i do to fix it. Thanks.