It's possible. It's not so much the actual act of letting go of the trigger, but rather, you are reducing the rearward pressure on the weapon. People tend to unintentionally relax their grip and control of a rifle when they release the trigger. That can allow the muzzle to tilt up. If it's a handgun, it could be that as well as not enough grip control (aka limp wristing).
Last edited by Reedo302; 07-31-2010 at 09:37 AM.