So my stepson has an awesome late cow tag this year and due to homework load wasn't planning on hunting early season. So we waited till our schedules worked to get out to sight his muzzy in now that we have a new peep on it. We went out yesterday. The gun is a T/C Thunderhawk stainless/synthetic, shooting 90 grains FFG 777, behind a Hornady Great Plains Bullet. The peep is the NECG weaver mount. We set up at 30 yards to start. The first shot was far left and low. Then the next 3 shots were about 2 inches right within 5 inches of center for elevation. So I stepped it out. I was curious to see what it would do so I took the target to 100 yards for a shot or two. Then he goes to take a shot and the aperture is gone. It came loose in the field somewhere between us and the target. So had no choice at the moment then to put on the second one that came with the sight that has a bigger hole. He shot 9 more shots and I tested 2 out of it with me shooting. All the shots besides the first one and one I visible saw him jerk the trigger on were in an almost perfect line up and down. No more than 1 1/2 inches wide. That includes the 2 I shot. I had not seen that before. The shots covered 16 inches top to bottom but like I said the width was MAX 1 1/2 inches apart in width. Both my shots were much closer to each other in elevation so I suspect it may be his breathing but he insists that it was the same every time. We will get out for more practice another time but I just thought it was interesting that all the shots were so close in windage but so spread out in elevation. I also hope to shoot it more myself to see if the up and down size of the group shrinks or not, that might help narrow down what it might be so I can coach him a little better on it. Overall he is doing much better each time we go shooting. I was really happy to see that he can keep them so close for the windage.