If you are just going to be popping tin cans or shooting only at one distance with a basically stock 10/22, then maybe you could semi-permanently adjust that 3-9x40 scope's parallax to work okay. Be aware that the scope you ordered is really for a hunting centerfire, so the parallax is Probably set at 150 yards. Anything under that (basically all .22lr shooting) will have some parallax error, and the
target and/or crosshairs will be out of focus badly at close range at full power magnification. If you are keeping the factory stock, though, even in the lowest possible rings, you will have issues getting a good cheek weld. You can always add a cheekpad, but they are pretty ugly, and you would be better off spending that money on a better scope or better stock. If you are keeping the rifle basically stock, then the suggested super banner 3.510x36 is just about perfect. I had one on a heavy barreled 10/22 in a factory wood stock, and I was able to mount it low enough to work well with the factory stock. It offers enough magnification to produce decent accuracy, has good light transmission and image clarity, and offers the all-important adjustable objective. I wouldn't even consider a scope for a rimfire that didn't offer an adjustable objective, unless it was strictly for hunting and had a max power of 4-6x.
If you are building a TRUE
target rifle on the 10/22 platform, I wouldn't settle for so little scope. If you're going to spend the money on a heavy barrel,
target style stock, trigger work (or a new trigger group entirely), and all the tuning and bedding that goes into a true
target gun, the last place to skimp is on your
optic. You won't notice a few extra ounces from a larger scope once you put on a 4 lb match barrel. Hell,
target rifles NEED to be heavy if you want the absolute best accuracy, especially an auto-loader like the 10/22, because of all the movement of the action upon firing. I have built quite a few
target 10/22's and a few ultralight plinking/hunting 10/22's as well, and I can say that I've never thought, "I wish I had bought a crappier scope". For a scope that will keep up with the rest of a precision rifle without sending much money, I would go with either the
bushnell banner 6-24x40 or the banner 6-18x50. They are both excellent
scopes for the money and will help you to get the most from a
target rifle. I would go no cheaper unless you really aren't talking about a serious
target shooting rifle. I would lean more towards the 6-24x40 for a rifle with a lower comb so I could get a good cheek weld, and the 6-18x50 for a stock with a higher comb. I have 10/22's wearing each of these
scopes and they deliver good results. If you have an adjustable cheekpiece, I would go to the 6-18x50. While it does not offer as much magnification, it is brighter and the image a little cleaner at all available power ranges than the banner with the 40mm objective.
One last thing to think about is the fact that you will not be able to consistently see your bullet holes at 50 yards, much less 100 yards if you don't have quality
optics, enough magnification, and the ability to focus the image via an adjustable objective. With a scope more oriented towards
target shooting, you will be able to accurately spot your own hits and misses, and with enough power at longer ranges you can use the mirage created by heat waves as seen through the scope to help judge wind direction and speed. Good luck with whatever you choose. 10/22's can be an absolute blast!
If you are just going to be popping tin cans or shooting only at one distance with a basically stock 10/22, then maybe you could semi-permanently adjust that 3-9x40 scope's parallax to work okay. Be aware that the scope you ordered is really for a hunting centerfire, so the parallax is Probably set at 150 yards. Anything under that (basically all .22lr shooting) will have some parallax error, and the [link=http://www.opticsplanet.com/targets.html]target[/link] and/or crosshairs will be out of focus badly at close range at full power magnification. If you are keeping the factory stock, though, even in the lowest possible rings, you will have issues getting a good cheek weld. You can always add a cheekpad, but they are pretty ugly, and you would be better off spending that money on a better scope or better stock. If you are keeping the rifle basically stock, then the suggested super banner 3.510x36 is just about perfect. I had one on a heavy barreled 10/22 in a factory wood stock, and I was able to mount it low enough to work well with the factory stock. It offers enough magnification to produce decent accuracy, has good light transmission and image clarity, and offers the all-important adjustable objective. I wouldn't even consider a scope for a rimfire that didn't offer an adjustable objective, unless it was strictly for hunting and had a max power of 4-6x.
If you are building a TRUE [link=http://www.opticsplanet.com/targets.html]target[/link] rifle on the 10/22 platform, I wouldn't settle for so little scope. If you're going to spend the money on a heavy barrel, [link=http://www.opticsplanet.com/targets.html]target[/link] style stock, trigger work (or a new trigger group entirely), and all the tuning and bedding that goes into a true [link=http://www.opticsplanet.com/targets.html]target[/link] gun, the last place to skimp is on your [link=http://www.opticsplanet.com]optic[/link]. You won't notice a few extra ounces from a larger scope once you put on a 4 lb match barrel. Hell, [link=http://www.opticsplanet.com/targets.html]target[/link] rifles NEED to be heavy if you want the absolute best accuracy, especially an auto-loader like the 10/22, because of all the movement of the action upon firing. I have built quite a few [link=http://www.opticsplanet.com/targets.html]target[/link] 10/22's and a few ultralight plinking/hunting 10/22's as well, and I can say that I've never thought, "I wish I had bought a crappier scope". For a scope that will keep up with the rest of a precision rifle without sending much money, I would go with either the [link=http://www.opticsplanet.com/bushnell-banner-line.html]bushnell banner[/link] 6-24x40 or the banner 6-18x50. They are both excellent [link=http://www.opticsplanet.com/leupold-brand.html]scopes[/link] for the money and will help you to get the most from a [link=http://www.opticsplanet.com/targets.html]target[/link] rifle. I would go no cheaper unless you really aren't talking about a serious [link=http://www.opticsplanet.com/targets.html]target[/link] shooting rifle. I would lean more towards the 6-24x40 for a rifle with a lower comb so I could get a good cheek weld, and the 6-18x50 for a stock with a higher comb. I have 10/22's wearing each of these [link=http://www.opticsplanet.com/leupold-brand.html]scopes[/link] and they deliver good results. If you have an adjustable cheekpiece, I would go to the 6-18x50. While it does not offer as much magnification, it is brighter and the image a little cleaner at all available power ranges than the banner with the 40mm objective.
One last thing to think about is the fact that you will not be able to consistently see your bullet holes at 50 yards, much less 100 yards if you don't have quality [link=http://www.opticsplanet.com]optics[/link], enough magnification, and the ability to focus the image via an adjustable objective. With a scope more oriented towards [link=http://www.opticsplanet.com/targets.html]target[/link] shooting, you will be able to accurately spot your own hits and misses, and with enough power at longer ranges you can use the mirage created by heat waves as seen through the scope to help judge wind direction and speed. Good luck with whatever you choose. 10/22's can be an absolute blast!