barrel indexing and target ??????

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miatamama

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Jan 2, 2018
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erie Pa. usa
Hi! I have a question about barrel indexing. I sight my airgun at 10 meters. It doesnt vary hole on hole at 33 ft. But when I go to the club and shoot at 30 yards it shoots 1/4 inch to the left I bring it home and it is dead on. So my question is Do I have to index my barrel? If I re adjust for 30 yards to be hole on hole it is off when i shoot at home.

Second question Does anyone have multiple turkey silouete on one sheet? We are starting to shoot indoors on the 24th and would like to print the targets with turkeys instead of bulls or dots. JCS miatamama








 
Sounds like a classic canting problem. Either the scope is misaligned to the bore, or the gun is being held canted when shooting. See this thread for a DIY approach that works to eliminate both potential sources of error.

https://www.airgunnation.com/topic/best-way-to-level-a-scope-2/#post-1003404


Indexing has a different purpose. It is to orient the barrel in a manner that is most favorable to its vibration (harmonic) characteristics. The goal being to improve average group size, not correct a divergent POI.
 
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So, set it at thirty yards and then bring it home to see if it is off or not. Just an idea that may save you some time. It's also quite possible that your eye is in a different spot on yer gun, especially if the benches or table you sit at are at slightly different heights, so it may be a parallax thing as well. 

Otherwise, I would have to agree with nervoustrig.
 
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It could be a canting issue, as mentioned. Or, it could also be just one of those weird things. I have rifles that will vary slightly in the windage adjustment at different distances, don't know why. I assume it is related to the rotation of the pellet, which might result in a variation on either side of the POA. I don't think it's a canting result in this instance, as I've observed it with the rifle set up level on the bench. Go figure.
 
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3ECE8048-3267-4F08-AF83-E303A8B143EB.1637262350.jpeg
This might help some too.
 
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Thanks to everyone who tried to help me. I have learned alot on cants. I think i found the trouble. I used the plumbbob and found a slight bit of scope cant. Every mount screw was not even finger tight, all eight. I lined it up and tightened it back up and re zeroed. It is right on now and will try the further distances at the range next week. If not on at both distances i will come back for more help. Thanks JCS
 
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add a bubble level 2 the scope
Click to expand...

x1 on the bubble on the scope best place to put it
Click to expand...

I run a plumb line from the ceiling and align the cross hairs to the scope mounted bubble level. For an additional step before mounting on a rifle, the scope is mounted to an eBay special picatinny rail screwed to a solid bench to verify that it tracks strait up and down the plumb line after installing the bubble level. I read that even high-end scopes can track in a diagonal if built wrong. Then I mount it to the rifle and check for bore and shooting cant.
 
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