Posted on 11/26/2012 11:17:41 AM PST by learner
I purchased a powerful pellet gun for my sister and we sighted in for the correct distance. However the location of the scope will be different for her than it was for me as she is shorter and the scope needs to be more to the rear for her. Will this affect the sighting in or is it the same regardless of the location of the scope? Thanks for your help
You’re Gonna Shoot Yer Eye Out Kid!
Yes, you should re-sight.
If you move the scope on the gun, what zeroing in you did will be useless.
You will need to re-sight the scope. I’m not sure how accurate or at what distance you are sighting it. But the location of the scope combined with any magnification it has affects it’s sight. Moving it a 1/4 of an inch could affect the accuracy by an inch or two depending on the FPS and the distance you are sighted to.
Beyond that, simply removing it and re-placing it makes it prone to inaccuracies (again, depending on how accurate you are trying to make it).
It’ll be close. Move it to the rear by loosening the screws just enough to allow the movement. Then have her test it and make final adjustments.
In your case, the very act of moving the scope on the mount will require re-zeroing or verifying zero.
Yes, move it and have her sight it in with your help.
It may or may not. Any movement in the scope mount can change alignment. You should be able to find a location which works for everyone.
If you are talking about sliding the scope fore and aft to change eye relief, then the change in point of impact should not be huge. After all, you are moving along the same axis as the bore, not lateral to it. Changing mounts and moving the scope up or down will have a major effect though.
Is the rifle a springer or pneumatic? If it is a pneumatic the type of scope is not important.
If it is a springer it has to have a scope designed to withstand the back and forth recoil. If the scope came with the airgun as a package it probably is the right type of scope.
Odd as it sounds, a powerful springer air gun will destroy a regular scope fairly quickly tho the recoil is far less than a high powered powder burner.
Scopes have an eye relief distance. Ideally, the eye relief should be adjusted per shooter. Practically, a shooter can be trained how to use a longer eye relief.
The operative function is the alignment known as ring in ring. As you move back from a scope, there will form a black ring around the view field. That black ring should be centered (equal thickness of black ring all the away around) on the exterior rim of the scope. This will more likely be an issue for the shorter person. Once the ring in ring is centered, then the remaining sight picture can be developed. This of course takes practice.
IF she can adapt to the longer eye relief, you can set the eye relief for you and not adjust the scope position.
Put a removable butt pad on it. Zero it for yourself with the butt pad in place. Remove the butt pad when your sister uses it.
If it is just an eye relief issue, you can try the following.
Sight the air rifle for the person who needs to be closest to the scope. Fit a slip-on recoil pad which increases the length of the butt stock, thus increasing eye relief, whenever the second person wants to shoot the air rifle.
D’oh! Ya beat me to it.
Another solution is a scope with an adjustable eyepiece. But, who's going to mount a $400 Leupold scope on an airgun?
To ALL, Thanks for all your responses. I was not explicit enough. I am in PA and my sister is in MD. We had to remove the sight to ship the gun. My sister is older and we were trying to get the gun ready for her. The distance we sighted was 35 feet, which is the distance from her second floor window to where the squirrels are under her bird feeders.The only change she will need to make is moving the scope further towards the rear of the rifle.
It sounds like most of you are telling me that a.) the mere removal and b.) the backing up of the scope will totally change our sighting efforts. Is this correct?
Here is the gun & scope:
http://www.crosman.com/airguns/rifles/break-barrel/CD1K77NP
Thanks
If she has small eyes, squinting is unnecessary.
I'm 60 years old and we called those toys. I got my first when I was 6 years old.
After I got my first real firearm 6 years later, I never confused the two.
I shoot nuisance critters around my cave with a Thompson Contender - single shot, 16" barrel, .22 LR barrel. Nobody can tell where one shot comes from.
Of course, I also have an interchangeable barrel chambered in .45-70, but that would be overkill and might attract some attention.
Spring-piston guns are not firearms and don’t behave the same as firearms. The point of aim is very dependent on the way the gun is held and consequently will change from shooter to shooter. A friend of mine owned the exact same model gun, in the same caliber, with the same scope mounted on it, only the mounts were different. After carefully sighting in each, we traded guns. Guess what, they shot to different points of impact.
The old adage about handgun shooters being able to easily learn to shoot rifles, but the reverse not necessarily being true also applies to spring-piston guns. I’ve known decent firearm shooters that couldn’t hit worth a darn with a spring-piston gun. When shooting a firearm from the bench it’s not unusual to let the fore-stock just rest in the sandbags without gripping it. If you do that with a spring-piston gun it will throw pellets all over the paper. But, with a consistent firm hold most modern spring-piston guns will stack pellets.
Pneumatics behave much like firearms, but spring-piston guns and the shooter are a package deal—change either one and the point of impact changes.
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