No-one has made mention of parallax, which is perhaps one of the most important considerations for a 22 target scope.
Parallax adjustment – either side focus or adjustable objective – will bring the target sharply into focus at different distances, most notably when you are shooting targets shorter than 50m.
If you plan to shoot targets at 50m, you'll likely also be shooting them at 25m, so you need a scope that focuses at least down to 25m. Many rimfire target scopes focus down to 10m, though that may not be necessary.
Ziad wrote:For a target rifle The bigger objective allows more light in the lenses which is good. 30mm tube is better than 1inch tube, more ups and also more light. So go a 50mm objective if you can.
I don't think that's entirely necessary for a rimfire scope for a couple of reasons.
The first is that most target comps are shot during the day or under lights at night, when light is not an issue. A 50mm objective is fine for low light and maybe if you have a high magnification (bigger exit pupil, easier to get your eye behind), but it usually comes with a weight penalty.
30mm tubes are also heavy and they do not add to light-gathering ability. The only advantages 30mm tubes provide are more windage and elevation adjustment, and added strength. Good for hunting or shooting over long distances, but perhaps not needed for rimfire targets at 50m.
You usually have a better choice of scopes and rings in the 1" range.
You haven't said what type of target shooting you plan to do, but if you are going to be shooting offhand, you will appreciate a scope that does not add too much weight to the rifle.
If you plan to shoot rapid-fire or any discipline where fast target acquisition is important, you do not want too much magnification. Typically 4-6x at the low end is what you would use initially.
At the high end, higher magnification is better for supported shooting (benchrest, bipod, stand etc) or more experienced offhand shooters who can use it, but it's also something you can grow into as you become a better shooter.
Magnification alone will not help if the glass is poor quality, so don't just look at the magnification, look at the overall package.
Taking all these things into account, you probably want a 1" scope in the 4-16 or 6-20 range with a 40mm objective that focuses down to 25m and isn't too heavy. You'll probably want a thin or target style reticle for target shooting, or a normal plex style reticle if you also plan to hunt.
In your budget, Leupold and Bushnell make a few scopes you can buy new or second hand, while Weavers can also sometimes be found new but mostly second hand now that they are not being made anymore.
Leupold
VX2 4-12x40, 6-18x40
VX3 4.5-14x40, 6.5-20x40
You want the "AO" models (adjustable objective) that go down to 10-25y
Bushnell
4500 4-16x40, 6-24x40
These both have SF (side focus) down to 25y
Weaver
Grand Slam 4-16x40 (SF), 6-20x40 AO
Special mention goes to the Leupold VX2 3-9x33 EFR – it's a great little scope that punches above its weight and is very handy on a rimfire rifle, but if you are serious about target shooting, you will soon outgrow it. But it is a great starter scope within your budget.
These are just some examples of the more popular scopes you'll see at rimfire matches. Others may chime in with similar recommendations.
As for the rifle, you usually can't go wrong with a CZ new or second hand. They are cheap and far more accurate than their price would indicate.
My only other advice is to buy the best you can afford. I've seen so many shooters buy cheap scopes only to upgrade them in a short time. They would have been better off buying a good scope to begin with and not wasted money on continual upgrades.
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