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off-center scope mounting

 
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  #1  
Old 04-25-2007, 12:25 PM
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off-center scope mounting

I have a question that I'm hoping more experienced long-range shooters can help answer. I inherited a gun that my father sporterized from a 7.7X58 Arisaka. Along with the walnut stock and turned-down bolt handle, he fabricated what seems to be a very sturdy scope mount. However, the mount is off to the left, approximately 2" from the line of bore. I've shot the gun a few times and had no difficulty sighting it in or getting decent groups from it.

My question is: What will the left-of-center scope mounting mean for shots beyond say 275 yards?
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  #2  
Old 04-25-2007, 05:42 PM
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Re: off-center scope mounting

If sighted in @ 275yds I'd suspect that all impacts beyond that distance would be to the right of your point-of-aim. Not a good idea for shooting at any long range but shoud work fine for muzzle to zero range.
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Old 04-25-2007, 06:43 PM
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Re: off-center scope mounting

If it is offset 2 inches to the left then it will shoot two inches right at twice the distance it is zeroed at.
If you are zeroed at 275 yards then it will be 2 inches to the right at 550 yards. It will be four inches to the right at 825 yards -thrice the zero range.
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Old 04-25-2007, 08:55 PM
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Re: off-center scope mounting

Wouldn't the rifle shoot 2 inches to the left at 500, if you are zeroed @ 250? I would think of it like an X, with the bottom left end of the "x" being the scope, the bottom right of "x" is the rifle, the center of "x" is where it is sighted in at. Wouldn't the top left side of "x" where the bullet would impact?



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  #5  
Old 04-25-2007, 11:09 PM
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Re: off-center scope mounting

I'm with sharpshooter on this one, impact will be to left of line of sight beyond zero point. Good analogy on the X thing sharpshooter!


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  #6  
Old 04-26-2007, 04:59 AM
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Re: off-center scope mounting

Sounds to me like whoever set that rifle up had an eye dominance situation. Many shooters never check to see which eye is dominate. Often a shooter will struggle with poor results and find out that all along, they've been trying to shoot with their right eye and they are actually left eye dominate. The answer to this is an offset scope. This arrangement allows a right handed shooter to use their left eye to shoot. I hope I understood, correctly, the scope mount you mentioned.
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Old 04-26-2007, 06:33 AM
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Re: off-center scope mounting

Sharpshooter

You are right! It is the line of sight that is to the right not the bullet. The bullet would be to the left.
Thanks for the correction.
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