Air Venturi Avenger scope

I have a avenger 22. Its accurate at 50 yards but at 100 yards it shoots about 1 foot to the right. Even if I sight it a little to the left at 30 yards it still shoots a little to the right at 100.
Any ideas?
My best friend in New Mexico has an Avenger synthetic.22 cal. He shoots Prairie dogs at 150 + yards with extreme accuracy. Need a little more information to help
Do you have a Chronograph? I don't , so I watch reviews on you tube , and see what the most accurate pellet is. What weight pellets you using, what is reg set at , how old is rifle , did you clean it , and how did you clean it . Do you use a Moderator , and what size is it.
One of the variables above might help me to help you.
OldVet wants to help.
 
I guess this gives me an excuse to buy a scope level. I’ve always just eyeball on all my high-power rifles and never had a problem, but I’ll try it.
I’ve always used a couple different ways to get as close as I can… one is just using a perfectly vertical reference and making sure the scope and bore are straight up and down and positioning the vertical crosshairs in alignment with the vertical reference… another is to use a plump bob…
 
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