I had a buddy that got one of these the and was shooting it the other day trying to sight it in. It's a Omega Z5. He is shooting 2 50 grain Pyrodex pellets with a 250 grain shockwave. It wouldn't group for much of anything. Shots were all over. Finally he got it to start hitting decently close to the same spot and once he got it within a couple inches of the bullseye he left it. They were saying they had never seen a gun take that many shots to sight in. I have however but I will say I don't know if it was them or not but it wasn't shooting good at all.

On the other hand his brother also got one that seemed to shoot pretty well.