I installed the Bugbuster on a 2300S. The windage was no problem but the elevation was a bit of a challenge for me. The last time I had/used a scope was 35 years ago on a 22LR. I don't remember it being so difficult to zero the scope. I had to turn the elevation turrent quite a bit to get POA/POI is that normal with these scopes? I'm assuming it would bottom out if turned too much?? And yes I shimmed it, checked that the reticle was center which it was low 10 clicks, and made sure the scope mount screws weren't too tight. I must say I'm liking the scope it really shows you when you break the trigger and move off your target so you can't blame the pellet I realized I'm a lot more shaky than I realized