I mounted a scope on a Ruger Super Redhawk 480. I would shoot it at 25 yds, move out to 50 yds and I would be all over the place. At first, I thought it was me. Then I started looking carefully and noticed that my scope was moving and I could not repeat the groups at 25 yds. Ended up putting loctite on the screws and really cranking it tight. Have not had a problem since.
Moral of the story, it may be the scope or the mounts. Your shooting of other guns shows you can shoot and this 22's accuracy is just plain unusual. Some scopes are just junk. They won't hold zero worth a darn. Perhaps this is one of them.
If things don't improve, consider pulling the scope off and shooting with open sights at 10 and 25 yds to see what it shoots like from a bench (good rest). The idea here is to convince yourself that it is not the rifle and hence has to be the scope.
Bushnell makes a 3-9x rimfire scope that runs around $50. It is an okay scope. There are better ones of course, but it's okay. I have new one laying on a shelf that I was going to put on a 22 and then changed my mind for a little better scope. I chose Weaver 2.5-7x rimfire. Good scope.
Yellow jackets, velociters, stingers etc generally don't shoot as good as regular high velocity 22 ammo. You should be able to test the rifle, eventually sight it in with cheaper stuff, then tweak the scope for what you might want to use hunting. Regular CCI high velocity HPs should be just fine. You don't need to shoot up the more expensive stuff until the accuracy issue is solved.
With Remington Thunderbolts, I get around 0.75" groups at 50 yds with one of the rifles I shoot a fair amount. Usually that means 3 or 4 shots pretty tight and one flyer.
It is not the ammo. Good luck with your efforts.