CraigC
Sixgun Nut
The Mueller is very good, better than most other scopes in their price range but if you want a Leupold, only a Leupold will do. You have some options. I'm leery of big variables on rimfires unless they're dedicated target guns. You really don't need much more than a 3-9x or 4-12x class unless you're shooting benchrest. Those scopes will be much more useful should you decide to do some small game hunting. Put it this way, I have a Mueller 4-16x tactical model on my Savage 93R17 .17HMR. I shoot small critters, targets, rocks, clay pigeons and crows out to 250yds and rarely go above 8x. I also really don't like messing with AO's in the field but this is where the individual must find their balance. One option would be a VX2 3-9x, send it back to Leupold to have its parallax reset to 50-75yds. Or simply get an AO model in the 4-12x or 4.5-14x class.
I wouldn't go over a 40mm objective because they can be a pain to get mounted. They often wind up being too high to get a good cheek weld and I believe the comb on your rifle is a bit low for iron sights anyway.
What will be an issue is getting on paper at 300yds without a canted mount. I suggested the Savage because they have 20 or 25MOA mounts available. This will get you on paper at 200-250yds without using up your scope's adjustments, depending on the loads you use. Burris Signature Zee rings with the offset inserts will get you some more elevation if necessary.
I wouldn't go over a 40mm objective because they can be a pain to get mounted. They often wind up being too high to get a good cheek weld and I believe the comb on your rifle is a bit low for iron sights anyway.
What will be an issue is getting on paper at 300yds without a canted mount. I suggested the Savage because they have 20 or 25MOA mounts available. This will get you on paper at 200-250yds without using up your scope's adjustments, depending on the loads you use. Burris Signature Zee rings with the offset inserts will get you some more elevation if necessary.