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MOA Picatinny rails

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/04/2010 at 00:52
txcycleguy View Drop Down
Optics GrassHopper
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I will generally be shooting from 100-500m.  I am putting together a .308 rig that will be based on on a rem 700 sps.  I will upgrade the stock and add a Mark V scope.  The majority of my shots will be hunting and between 100-250m.  I want to know if I get a 20 moa rail, if it will be to much moa for shorter shots.  This weekend on a similar rig a friend dialed out to 500m with a scope zeroed at 100 and nearly maxed out the dial.  

So, I guess the question is would a 20 MOA rail be to much for a short(100m) shot? I'm sure I could adjust the hold over if so.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/04/2010 at 04:56
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Optics Jedi Knight
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Lord Of The Flies

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In my opinion yes, the rails would be to much, specially for hunting situations which calls for first shot accuracy and quick target aquisition etc.
 
Is your friend's rig set up correctly?
 
RANGE   DROP
100     0"
200     2.87"
300     11.2"
400     25.6"
500     46.9"
600     76.0"
700    114.9"
800    161.7"
That means 9.4MOA and with 1/4 inch clicks 37.52 clicks from zero should put you on target at 500yds. The scope should have 50 MOA dialing each way, so you are not maxed out at 37 or 38.
 
Maybe consider a 5MOA or 10 MOA base??
 
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/04/2010 at 08:56
Urimaginaryfrnd View Drop Down
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Resident Redneck

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Have you considered the 700 XCR Tactical which is a highly corosion resistant dark in color "TriNyte" finish over stainless?  Not sure where 8shots balistic chart came from ??  JBM balistics shows a 168 SMK 2600 fps .308 as follows:

distance     MOA    MIL
100               X        X         Zero distance
200             -2.2    -.6
300             -5.1    -1.5
400             -8.6    -2.5
500            -12.7   -3.7
600            -17.3   -5.0
700            -22.7   -6.6
800            -29.0   -8.4
900            -36.2   -10.5
1000          -44.6    -13.0
Obviously results vary due to elevation above sea level temperature humidity etc etc.
You have me a little confused talking about a Mark V scope which I assume you mean a Leupold Mark IV Tactical.  The total amount of internal adjustment on a 4.5-14 Leu Mk4 is 100 moa which is an ideal world would be 50 MOA above and 50 MOA below.  Many scopes do not have sufficient internal adjustment to shoot to 1000 yds and past. With a flat base all should be able to make 500 yds.  The plus 20 MOA and plus 30 MOA bases are for extreme long range typically 1000 yds plus.  I suggest you consider the two new models of Super Sniper scopes that are 1/10 mil clicks with mildot reticle which I much prefer to 1/4 moa click scopes. It makes a big difference having the reticle and the adjustment matching.  Both Mil and MOA are measurements of an angle like a piece of pie. The 3-9 model is FFP first focal plane which has several advantages as with this system mil dot rangefinding can be done at any power and the mildots can be used for know hold over at any power.  For example you are zeroed at 100 and you have to engage a target at 600 using the reticle you can hold 5 mil dots over and the next target is at 400 which you know is -2.5 mil you can judge half way between the 2nd and 3 rd dot for hold over or you can dial in the entire 2.5 mil or you can dial in .5 and hold on the second mildot down. You just cant do that with a 1/4 moa based knob unless the reticle is moa based also like some of Nightforce's reticles. Anyway consider these two scopes the 10x has rear parallax adjustment and is a heavy duty model that the military specifically ordered so there is a limited supply of them ever.  With these two scopes even wiht a flat 0 moa base you wont run out of internal adjustment they will easily get you well past a thousand wiht a 100 yd zero.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/04/2010 at 09:08
Urimaginaryfrnd View Drop Down
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Resident Redneck

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This is a Remmington R5 Mil Spec stainless with Walter Birdsong Green T finish Badger Ordnance plus 30 moa base with 3-9x42 Super Sniper.  I actually had to select the scope based on having purchased the plus 30 moa base I needed a scope with a huge amount of internal adjustment to be able to have a 100 yd Zero.  The first scope I ordered in had only 50 moa total of internal adjustment which would have left me 5 inches high at 100 even with it bottomed out which is not good.  It really does make a difference how much internal adjusment a scope has if you plan to not only shoot 100 yds but also 1000 yds  and there are very few scopes that have enough adjusment and most are very expensive.    The R5 in a .308 is the 11.25 twist barrel that is used on the M 24 and is designed for the heavier 175 to 190 gr bullets which are needed to shoot past 1000 yds.  

Edited by Urimaginaryfrnd - May/04/2010 at 09:11
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/04/2010 at 09:50
supertool73 View Drop Down
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Superstool

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You will be able to get a 100 yard zero with a 20 MOA base and pretty much any scope that has over 50 MOA of elevation.  (I am sure there have been exceptions to this but in most cases it would be fine)  Typically a scope with around 70 MOA or more with a 20 MOA base you can zero at 100 yards and be able to dial in to 1000 yards, maybe a touch more. 

I have a 30 MOA base on my precision rifle and have a 100 yard zero and can dial in 1300+.  Not that my .308 shoots very good that far, but my scope is capable of it. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/05/2010 at 04:10
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Optics Jedi Knight
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Lord Of The Flies

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I agree with Supertool that given the fact that the scope has 50 MOA from Zero, you can set it on a 20 MOA base and zero it on 100yds by simply dialing down 80 clicks (1/4 MOA per click).
So it can be done.
But how will the scope and rig handle for hunting at 100yds with the rear of the scope elevated on a 20 MOA base?
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