Advice needed on mounting the scope while keeping optical center intact

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mubhaur

mubhaur

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Nov 8, 2015
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Karachi, Pakistan
Today I need a piece of advice from you regarding mounting and sighting in a scope. You know I have been doing all this for more than two decades but yet I need your advice. I start mounting procedure of scope from optically centering it. I use the box method to optically center a scope. Mirror method never worked for me perfectly. After optically centering the scope, I install it using FX No Limit mount on my FX Royale. Then I shoot a pellet at 24 yards. What I see is that there is a need of vertical adjustment which I do using the mount's adjustment. But there is also a need of windage adjustment. The pellet hits around 6" left than the POA. I dont want to use scope turrets to bring the POI at POA as it will bring the scope out of optical center. In this situation I have no other option but to shim the dovetail of the front mount. I shim the front mount at its its left side of dovetail. The gun starts hitting the POA. I am happy that all is good. But when I try to hit a target at 50 yards, the gun hits at 2" right. What I understand is that by shimming the dovetail, I caused misalignment of scope tube and the barrel. That is why at certain distance it hits bulls eye. Before that distance it hits left and after that distance it hits right. Now I want to seek advice from you that what is the ultimate solution of such situation. I hope that if I dont shim the dovetail, the misalignment will vanish but in that case I would have to adjust the windage turret of my scope and it will go out of optical center. Please advise, Regards, Umair Bhaur
 
Try to get your scope mounts parallel to your stock/barrel. May have to shim your scope mounts on the rail instead of shimming the scope inside the mount. But first make sure that all adjustment on the mounts are in the middle and that the mounts are squarely on the rail and not on crocked.

Chairgun has a shim calculator, may be able to use it for the mounts too.
 
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If the center of your mounts are not centered on your barrel, the scope will not be straight. Normally, the mounts should center fairly good on the barrel center by themselves and would only need a small amount of shim for the scope inside the mount if you prefer not to touch the windage turret. But maybe your mounts are somehow not seated squarely on the dovetail. I use BSA fully adjustable mounts which have both windage and elevation, 
 
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