I put a Nikon ProStaff Target EFR on my Mossberg 42M (c). IMO, it's an awesome scope.
If you are considering the Nikon EFR scopes, I believe they focus from 10 yards to infinity. The Nikon’s nice are optics and are wise choices for rimfires, IMO. They should be able to handle whatever distance you want to shoot.
The adjustable objective on the Target EFR might be something a lot of folks might not want to fool with, which is understandable. I don't have a problem with adjusting it. I actually got pretty decent at doing it quickly!
I don’t care for Nikon scopes because their glass and my eyes aren’t compatible. There are two exceptions though, the original Buckmasters and the Target EFR. I’d be happy with the Nikon Target EFR on any rimfire.
Any eye relief or eye box issues? I read a few posts where the eye relief gets a little tight on this scope.I'd suggest a Mueller APV, either the 4.5-14x40 or the 2-7x32 depending on how much magnification you want. I have the 4.5-14x40 on my Mark II FV that I dropped in a Boyds stock. Even as an iffy marksman by my own admission, I've wrung .6 MOA out of it.
http://muelleroptics.com/products/mueller-apv-4-5-14x40ao-black/
http://muelleroptics.com/products/mueller-2-7x32-apv/
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Any eye relief or eye box issues? I read a few posts where the eye relief gets a little tight on this scope.
If I have a fixed 50yard parallax (rimfire scope) will I have issues at 100yards?
You can't beat that with a stick! Personally, I prefer fixed powers. I've never used a variable power scope on anything but the lowest power in the field (why pay for a feature I don't use?) And I consider 4X to be about perfect for most hunting -- including squirrel hunting.
75 yards is ideal for a .22, especially for squirrel hunting. By coincidence, if you zero dead-on at 50 feet, you'll be on at 75 yards. And with a traditional dual-X crosshair arrangement, the bullet will impact at the top of the thick crosshair at 100 yards.OHI, I have never had an issue with Nikon's PROSTAFF Target EFR reticle disappearing while squirrel hunting in wooded areas. I zero for 75 yards so my adjustment is about 1.5 high at 50 and 3.5 low at 100. This holdover/under is easy with this scope. I shoot suppressed supersonics too.