I've got a Tasco red dot mounted on my Sporty in 22lr. Light weight and Handi.
2 inch spinner at the chicken berm of a rimfire silouette range is not safe. Remington Golden Bullets bulk pack ammo.
Given some trial and error it'll hit rams from a rest as well.
Red dot has 11 brightness settings. Takes some fiddling to get it just right for the light conditions you are shooting in and how much target you want to cover. Brighter dot has a bit of flare to it, making the dot seem bigger when cranked up real bright. Not sure of the size of the dot at what range. It's an older model, not sure if I still have the owners manual.
I've leant this set-up to a few first time shooters. Great for them, put the dot on what you want to hit and squeeze the trigger. First few times on paper then to spinners and clays rested on the berms.
Overall it's a neat set-up.
If you want more info on this particular red-dot, I'll try to find the book.
Hope this helps.
Nixter