I have a Gamo Whisper in .177 caliber.It is a piece of garbage. It will not shoot in the same place twice. I have tried every kind of pellet sold around my area. It does not matter if I use open sights or the supplied scope. My son-in-law had the same results with it. Read the reviews on the airgun forums about them. Not good ! The only good thing about it, is that it is very quite. I am now considering replacing it with a Benjamin NP. It has a nitrogen propelled piston in it instead of a spring.