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Reason to use zero MOA base on railed rifle?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2013 at 12:03
owenslee View Drop Down
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If most quality scopes have more than 40 MOA internal vertical adjustment...why would you ever select a zero MOA base for a picatinny equipped rifle?

It seems regardless of the intended distance to be shot that a 20 MOA base could extend your potential range with no downside.

Why should I ever buy a zero MOA mount if a 20 MOA will accommodate reticle adjustment to close range while extending long range potential?

Am I missing something?

Thanks.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2013 at 12:38
cheaptrick View Drop Down
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I feel the same way. 

Some folks feel a canted rail makes them raise their head "just a tad" over a non canted rail. 


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2013 at 13:03
billyburl2 View Drop Down
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It really depends on far you want to shoot, and if you are more concerned with potential internal adjustment or absolute optical clarity. Because remember, the closer the to center the erector tube is to center, the better the image is going to be. There are always going to be trade-offs.


 Just for the record, I run a 20 minute rail on both of my rifles... 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2013 at 13:24
owenslee View Drop Down
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Originally posted by billyburl2 billyburl2 wrote:

It really depends on far you want to shoot, and if you are more concerned with potential internal adjustment or absolute optical clarity. Because remember, the closer the to center the erector tube is to center, the better the image is going to be.
 


You make an excellent point I had not considered.

Given that logic... it would seem that with a 20 MOA rail,  as you adjust your come ups from zero...you are moving closer to center and improving your optical clarity in the process...where you need it most... at longer range.

However by using a zero MOA base and zeroing at scope center...your clarity is greatest at close range where it is less critical.... and as you adjust your come ups away from scope center-line...your optical clarity is being diminished at longer range.

It would seem the 20 MOA base is again an advantage.

I suppose the theoretical ideal would be to insure your normal adjustment range "average" falls as close to the scope center as possible.  i.e. if you intend to shoot over a 40 MOA total range...20 MOA below center and 20 MOA above center would seem to  provide the best average optical clarity overall.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2013 at 14:02
billyburl2 View Drop Down
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True, if all the factors align themselves. You also have to consider the fact that most man made things do not like to live at the extremes of their "range". 

 It also depends on the machining of the rifles receiver, alignment of the barrel, height of the scope over the barrel, ballistics, and of course cheek-weld. Not to mention the internal adjustment range of scope. Basically, there are no set a dried answers to every situation.
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