Eye relief varies with scope. Most good centerfire rifles use something around 4 inches, a few to 5. the Scout scopes are 2 or 3 time further out. Some of the better scope offer some flexibility with this window. Most variable scopes also vary the eye relief, less as you dial up the power. Some of the new Nikon Monarchs claim to have a fixed eye relief over the range of the scope, a nice feature.
About the time you get pick up one of this nifty half moon scars in your eyebrow, you begin to appreciate good (proper) eye relief. on a rimfire, this is not an issue.
You do want to mount the scope with eye relief in the proper eye relief range when you pull up the rifle for expediency, the best picture possible, and to avoid the infamous half moon scar.
Leupold makes some very nice rimfire scopes you should look at before putting your money down. I like Leupolds, but there are other good ones out there.
My 2 cents worth for the evening. Good shooting!
