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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
How much elevation travel for a mile
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<blockquote data-quote="nkyshooter" data-source="post: 2132808" data-attributes="member: 83787"><p>Depending on your muzzle velocity and the BC of the bullet you choose, you'll likely need a 40moa rail for it ... </p><p></p><p>In general, when you scope is "zeroed" with no rail elevation, your scope is (again, "in general") at about halfway through it's elevation travel ... in your case that 75moa/2=approx 37moa of usable. From there you add using the mounting system.</p><p></p><p>If your velocity/bc combo says you need mid 60's moa, then you should make sure you have well into the 70's unless you want to be holding over using the reticle.</p><p></p><p>Note: some folks find the adjustments at the outer limits are not quite as precise. In addition, you are using more of the outer portion some of the lenses and my understandings is that the best quality optics in a scope are typically using roughly the centers of all the lenses ...</p><p></p><p>I'm in process of building a 1 mile range rig now ... It will be a 30 sherman magnum and I hope to be running 230g A-Tips in the 2850-2950fps range. Based on calculations, I'll need 55-60 moa of elevation. I'm planning on using a Burris XTR II that has 90 moa of adjustment ... so I'm only expecting about 45 usable. I have a 20moa rail to make it 65moa and while I "think" this should be enough, my backup plan will be to either move to a 30 or 40 moa rail depending on how short I am.</p><p></p><p></p><p>BTW - your 40moa rail will work just fine ... it just means you'll most likely have to zero at a distance further than 100 yards. But you'll have no issue getting your 60-70moa out of the 75/2(scope)+40(rail) (77ish) that you have.</p><p></p><p>Good luck!</p></blockquote><p></p>
[QUOTE="nkyshooter, post: 2132808, member: 83787"] Depending on your muzzle velocity and the BC of the bullet you choose, you'll likely need a 40moa rail for it ... In general, when you scope is "zeroed" with no rail elevation, your scope is (again, "in general") at about halfway through it's elevation travel ... in your case that 75moa/2=approx 37moa of usable. From there you add using the mounting system. If your velocity/bc combo says you need mid 60's moa, then you should make sure you have well into the 70's unless you want to be holding over using the reticle. Note: some folks find the adjustments at the outer limits are not quite as precise. In addition, you are using more of the outer portion some of the lenses and my understandings is that the best quality optics in a scope are typically using roughly the centers of all the lenses ... I'm in process of building a 1 mile range rig now ... It will be a 30 sherman magnum and I hope to be running 230g A-Tips in the 2850-2950fps range. Based on calculations, I'll need 55-60 moa of elevation. I'm planning on using a Burris XTR II that has 90 moa of adjustment ... so I'm only expecting about 45 usable. I have a 20moa rail to make it 65moa and while I "think" this should be enough, my backup plan will be to either move to a 30 or 40 moa rail depending on how short I am. BTW - your 40moa rail will work just fine ... it just means you'll most likely have to zero at a distance further than 100 yards. But you'll have no issue getting your 60-70moa out of the 75/2(scope)+40(rail) (77ish) that you have. Good luck! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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How much elevation travel for a mile
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