I wrote this a few years ago for another forum as a guide to purchasing a spotting scope that a rifle competitor would use for shooting CMP and NRA high power rifle matches and added some stuff from other forums. This assumes the shooter will use the spotting scope on his own while shooting the rifle on the firing line without a spotter.
The Spotting Scope For target shooting, look for a scope that has:
Angled eyepiece to allow you to look through the eye with minimal head movement so that your position on the rifle is maintained.
Long eye relief is very nice to reduce head movement and allow you to keep your glasses on while shooting.
The 60 to 80mm objective is the size to get, 100mm sizes are available but they are heavy and tend to tip over on the stand since they make the stand top heavy while shooting in the offhand or standing position. Smaller objective lens sizes are available but they do not transmit as much light and so are difficult to use early in the AM or late in the PM.
A scope that allows one to rotate the rear of the scope body and the eye piece is very nice to help you adjust the scope so that minimal head movement is required to shift you gaze from the rifle to the spotting scope and back again.
Most target shooters use a fixed power eye piece with extended eye relief at about 25x or 30x. If you want a variable power, you give up the extended eye relief. Most shooters with scopes that are variable power use 20-60x eye piece. Most never use more than 30x, at higher power the mirage on the range will become so visible that you’ll not be able to see the bullet holes. It does no good to magnify a poor image.
Water proof and fog proof is naturally a requirement since the match will continue if there is no lightning.
All scopes focus out to infinity; make sure that the scope you purchase will focus on objects as close as 10 meters. This will enable you to shoot anything from Blow Gun (air rifle) to High Power Rifle and still be able to see the target. When I purchased my scope, I made sure that at 50 feet (indoor small bore rifle distance) I could see an entire target card without having to move the scope.
Seeing bullet holes is nice, but the primary reason to have a spotting scope is to read mirage for sight adjustment in the wind. Focus the scope on the target then turn the focus knob about 1/8 to 1/4 turn to the left. You are now focusing on the mirage about the mid-range and with practice, can turn the windage knob on your sights to compensate for the wind that is apparent due to the mirage. Turning the spotting scope focus to the right allows you to see the mirage behind the target. Since that wind has no effect on your bullets desired flight; that information is of no value to you. Watch the wind between you and the target. Watch the up wind mirage for let offs and pickups. Watching downwind mirage is a waste of time since that wind is already past the target. Try to never shoot in a boil, when the mirage is running straight up. The mirage will stretch out the target and you’ll miss the X ring due to errors in elevation.
Eagle Optics has a good website to compare scopes.
I use a Kowa scope, mine is the older 821 model, now discontinued. I have never had a problem with the Kowa. I have a 27x extended eye relief eye piece.
I see many Konus scopes on the range and have looked through several and they are ok but to me, they lack clarity. I hear that the Minox is a good scope. Kowa seems to be the standard by which the others are judged.
Lastly, for hunting and photography, the straight body spotting scope is easier to use.
One could probably take all the Scope Brand names out of this discussion and boil it down to 3 categories:
$200 or less If you’re a new shooter starting out and/or on a limited budget you can get by spending around $200 or less on an entry level scope. It will allow you to see the shot spotters and scoring disks so you can compete and score for other shooters. You could stay with this scope forever unless your aspiration is Distinguished or President 100 achievements.
$400 - $600 For the more advanced shooter that is trying to move up in classification and needs to see mirage to stay closer to the middle. Added benefit: Resale Value when Upgrading.
$800 and up For the shooter that has the funds right from the start to buy once/cry once over the initial cost of the scope. Or the shooter who has been at this game for a few or more years that can now afford it so he treats himself to the scope and the benefits it provides in; Brightness and Clarity for Seeing & Reading Mirage to save points, Durability & Resistance to fogging... These are also the scopes you will see on the line @ Perry in the President 100 shoot off in the hands of the best in the country. Added benefit: Resale Value when moving on to another hobby.
Scope stand and head
Look for a stand that is about 48” tall; at 6ft tall this stand height works for me. They make a taller stands but they will be top heavy and the scope will fall over, and wind will make it wobble, so the scope will be difficult to look through. You will want a one inch diameter stand rod for strength. There is a First Strike stand and head that is showing up on the firing line more and more often and the stand owners are pleased,
http://www.first-strike-products.com/ . Creedmoor makes a fine stand and scope head as well. Both of these companies are owned by shooters that have vast experience
http://www.creedmoorsports.com/store/home.php. Giraud Tool Company makes a nice stand. I have never used one but have seen them at nationals; it looks very well made and functional.
http://www.giraudtool.com/index.html Dave Holub makes his HMR scope stand and head. I have seen one but never used it. I would say it would be good for occasional use or for a junior shooter trying to decide if he/she wanted to shoot in competition.
http://newhighpower.com/hmr.html
You should avoid the use of a camera tripod style stand for rifle competition. In the standing position, the legs will be splayed out and use up all the room on your firing point; you will not be able to stand close enough to the tripod to look in the scope. If you turn the tripod so that you can stand close enough then the legs will be in your neighbors firing point and the range officer will have you move your stand out of their way. In prone the camera tripod will not allow the scope to be low enough to the ground for you to use the scope. The little three legged things that some manufacturers include with their scopes are OK for bench use but they are mostly cheap pieces of junk that will not last; there are several broken one in the lost & found at my club. I set up my scope next to the bench on my scope stand so that the vibration from recoil and muzzle blast does not cause the scope problems.