when you shoot your gun with and without the can. is there a difference in point of impact? also between shooting a sonic round and a subsonic round? the reason for my question is this. I went shooting today but the only 9mm ammo I had was blazer brass. shooting at 25 yards the gun would put 5 shots in a quarter size group right in the bullseye. screw on the suppressor and it shot just as tight of group only 6" to the left. do you think going with subsonic rounds will lessen this difference in point of impact. this is not a new production state of the art suppressor. It was a new HE suppressor I had made up 25years ago and had been sitting in the back of my safe until today.