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Long Range Hunting & Shooting
A parallax question for veteran shooters
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<blockquote data-quote="Greyfox" data-source="post: 694392" data-attributes="member: 10291"><p>I have done a lot of 500 yard shooting with my Mil spec 308 using Leupold scopes with and without parallax adjustments. The fixed parallax scopes were factory adjusted to 150 yards. It's not very acientific but my typical group size measured on multiple outings using my Mark 4 and adjusting for parallax was 3" max at 500 yards. Using Leupold VX3 in 3.5x10 and a VX3 in 4.5x14, the groups were the same as those using my Mk4. Frankly, i was unable to detect much if any parallax movement of the crosshair with the non adjustable scopes by moving my head around at that range. Using the Mark 4, unless I was at the extreme ends of adjustment, parallax determination was difficult to finely adjust and found that image focus was more of a dominant factor. I do make a strong effort to use a consistent cheek weld with my eye centered in the scope which will elimate parallax effects if they do exist. For mid range hunting. I actually prefer a non adjustable scope. One less thing to be concerned with. My favorite scope is a Nightforce 2.5x10. I'm not sure what's going on in the OP's case, but I would think that if proper shooting form is being used, accuracy degradation is likely coming from somewhere else. At magnifications of 15x and above parallax adjustment start to become a lot more critical. IMHO.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 694392, member: 10291"] I have done a lot of 500 yard shooting with my Mil spec 308 using Leupold scopes with and without parallax adjustments. The fixed parallax scopes were factory adjusted to 150 yards. It's not very acientific but my typical group size measured on multiple outings using my Mark 4 and adjusting for parallax was 3" max at 500 yards. Using Leupold VX3 in 3.5x10 and a VX3 in 4.5x14, the groups were the same as those using my Mk4. Frankly, i was unable to detect much if any parallax movement of the crosshair with the non adjustable scopes by moving my head around at that range. Using the Mark 4, unless I was at the extreme ends of adjustment, parallax determination was difficult to finely adjust and found that image focus was more of a dominant factor. I do make a strong effort to use a consistent cheek weld with my eye centered in the scope which will elimate parallax effects if they do exist. For mid range hunting. I actually prefer a non adjustable scope. One less thing to be concerned with. My favorite scope is a Nightforce 2.5x10. I'm not sure what's going on in the OP's case, but I would think that if proper shooting form is being used, accuracy degradation is likely coming from somewhere else. At magnifications of 15x and above parallax adjustment start to become a lot more critical. IMHO. [/QUOTE]
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A parallax question for veteran shooters
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