GTA
Airguns by Make and Model => Crosman Airguns => Topic started by: trevlavo on December 17, 2011, 10:55:40 PM
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equipment; npxl .22 and leapers 3-12x44 swat ao ir
issue; i originally sighted in the rifle and had to shim the back ring with some 35mm film but had it hitting where i was aiming. recently i removed the action from the stock to do some trigger tweaking now its waayyyy off. i tried adjusting the elevation but ran out of down, so i pulled the shim out of the back ring. i still can only get it to about .5" high of where i want. im going to shim the front ring and try again so i have some elevation adj if i should need it. why would this happen?
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Don't freak out but is the barrel straight ? You should not have had to shim the scope to zero a NPXL, something is not right Batman ??? ??? :o
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Don't freak out but is the barrel straight ? You should not have had to shim the scope to zero a NPXL, something is not right Batman ??? ??? :o
umm, how can i tell?
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Mine did the same thing. I never figured out what caused it. Folks accused me of bumping the scope or other such stuff. Nothing like that happened. I finally ended up taking the scope completely off and starting from scratch. I took mounts and all off. While I had it all apart I gave it all a good cleaning and recentered the scope. When I had it all back together, somehow, it worked. The whole thing made no sense at all.
Richard
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Mine did the same thing. I never figured out what caused it. Folks accused me of bumping the scope or other such stuff. Nothing like that happened. I finally ended up taking the scope completely off and starting from scratch. I took mounts and all off. While I had it all apart I gave it all a good cleaning and recentered the scope. When I had it all back together, somehow, it worked. The whole thing made no sense at all.
Richard
yup, ill be doing the same thing. i just received my jm seal and moly. im still waiting on my gr bushing and brass barrel bushings from agt. when i do the lube n tune ill start over and re zero the rifle and hopefully itll be a happy rifle for a long time.
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Maybe the scope mount is kinked somehow ? I'd do what amb5500c says, re mount the scope and shoot her , see if that fixes it, ive never had to ever shim any of my air guns but ive only onwned a few...
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I've read shimming a scope is never a good idea but don't remember why. The way I
understand your post, you did not remove the scope or mount. That would tend to steer
me away from a scope issue. I would first check the reassembly making sure everything
is tight and the action isn't shifted any from it's original position. Especially towards the
rear. Next, if you are using a two piece ring mount, I'd reverse the rings. You know, front
to rear, and try to re-zero without shims. I'm not a tuner or smith, just offering a few
suggestions so take them with a grain of salt.
Please keep us informed of attempted solutions.
jim
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If the rear ring has a stop pin, perhaps it is not engaging the hole in the receiver.... or it has moved down and is holding the rear ring up too high instead of it seating in the bottom of the dovetail grooves.... Just a thought....
Bob
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thanks everyone for the input...im going to swap the mounts and try that, if not i might just pop for some adj rings.
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Com on people these are air rifles they all have there quirks, so called barrel droop is common.
its perfectly fine to shim a scope. stock screws become loose so they need thread lock tite, you have to do what ever it takes to rectify a problem.
air rifles need owners who are mechanically inclined/ or know how to research lol.
problems usually have easy fixes . adjustment have to be made every time you decide to shoot that rifle again from the last day you shot it.
if i had to i would even shim my stock if it corrected my scope from loosing adjustment.
btw if you use lock tite on your screws dont use the red color use the blue make sure the lock tite has been re mixed in its container before using it
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One thing that I suggest is to take a sharp pencil and put mark's on the rings and scope then put some on the mount and action, small lines. If none of the lines line up after a session or even a half dozon shot's your equipment is moving. Ed
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hey jimur i swapped the mounts last night and just got a few shots in before the rain set in, looks like that did it. i started over and centered the turrets and swapped the mount and was thinking id be way off, nope. first shot was about 1" high and 1" right. 20 clicks down and 20 clicks left and i was about right on. ill have to do some fine tuning when the rain goes away. once again thanks all for the help.
hey shadow im still gonna mark the the rings and scope for peace of mind. seems like these leapers rings that came with the scope and pretty decent and with 4 screws it holds tight.
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I'm glad that worked out for you.
Richard
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Great news trevlavo, good work! Nothing like ridding one's self of frustration.
Now go enjoy shooting the npxl and thanks for the update. I'm considering a
Leapers 1" tube x-12x40 myself. Apart from a Nikon on a .243 mdl. 700 Rem.
I've always used Bushnell but funds are a little tighter these days and thought
I might try the Leapers.
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<snip> Com on people these are air rifles.......... adjustment have to be made every time you
decide to shoot that rifle again from the last day you shot it.
Don't mean to be argumentative Mike. Many things affect POA to POI but if you are having to adjust a
properly zeroed scope each time you shoot then something isn't right. Unless you're referring to the
obvious distance, wind speed, etc. Probably either scope movement or scope failure to hold zero is the
culprit.
NOTE* I have found some scopes to require several shots after an adjustment is made to allow the
crosshairs to settle in to that adjustment.
jim
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Great news trevlavo, good work! Nothing like ridding one's self of frustration.
Now go enjoy shooting the npxl and thanks for the update. I'm considering a
Leapers 1" tube x-12x40 myself. Apart from a Nikon on a .243 mdl. 700 Rem.
I've always used Bushnell but funds are a little tighter these days and thought
I might try the Leapers.
im keeping my fingers crossed and hoping its not a fluke, but i just put 3 rounds into almost the same hole at 25yds, ctc not more than 3/8". phones charging then im gonna take a pic.
hey jim on the scope id say leapers more than adequate for air rifles. i used to have a leupold on a 25-06 and it was a nice scope but costs 3x as much as the leapers. my uncle had a bushnell elite and even a zeiss and those are really nice but 6x as much. so what im gettin at is for 100. you cant go wrong, im really liking my leapers with turret ao. everything is very clear and sharp when focused and with the 44mm obj target acq is quick. since these scopes are built with springers in mind they can take a beating. wind/ele turrets clicks are positive and reign in the poi quick. even after i swapped the mounts and re centered my turrets i was shooting acceptable groups in 3 shots. so really no waiting and shooting mult rounds to get the crosshairs settled.
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I've read shimming a scope is never a good idea but don't remember why.
jim
When you shim a scope mount, the mount remains on the same plane as the receiver. The shim forces the end of the scope that you shimmed up so the scope doesn't fit the mount rings properly. When you tighten the screws to the rings, you can distort the tube of the scope on the end that isn't shimmed and mess things up. The best way is to shim the base of a ONE PIECE scope mount where it meets the receiver so the scope stays in the same plane relative to the rings. Using a high mount and a medium mount is an extreme example of the misalignment.
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oh well, somethings working. five shots at 25 yds 14.3 cphp. disregard the low and left hole, its from another target on the page. pellet shown for scale. this is an 8.5x11 page with like 12 targets on it, this is the best one.
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I've read shimming a scope is never a good idea but don't remember why.
jim
When you shim a scope mount, the mount remains on the same plane as the receiver. The shim forces the end of the scope that you shimmed up so the scope doesn't fit the mount rings properly. When you tighten the screws to the rings, you can distort the tube of the scope on the end that isn't shimmed and mess things up. The best way is to shim the base of a ONE PIECE scope mount where it meets the receiver so the scope stays in the same plane relative to the rings. Using a high mount and a medium mount is an extreme example of the misalignment.
Good info Deane, thanks. I think that's what I couldn't remember. That's the way it is at my age. :D
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oh well, somethings working. five shots at 25 yds 14.3 cphp. disregard the low and left hole, its from another target on the page. pellet shown for scale. this is an 8.5x11 page with like 12 targets on it, this is the best one.
I've seen flukes trevlavo, this looks more like just good shooting to me. Nice! Ain't it fun when you eat the bear? ;D
Thanks for the thumbs up on the Leapers too.