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20 moa rail issues

 
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  #8  
Old 05-29-2014, 01:54 PM
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Join Date: Mar 2010
Location: nw Montana
Posts: 139
Re: 20 moa rail issues

take the back screws out of the rail and see if the rail is floating.
on a weaver 20 moa on a remington a lot of times it is and if u tighten it
u will get 12 moa or so. maybe your rail is not perfect for your action then
u will have to shim or bed the back of your rail. it happens a lot.
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  #9  
Old 06-10-2014, 12:57 AM
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Join Date: Jul 2012
Location: Washington State
Posts: 458
Re: 20 moa rail issues

38 minutes of total adjustment is not enough to do both sight in and dial-up for range. You need a 30mm scope tube to get more adjustment. You are going to fight the mount for way too long for way too little improvement.

Use the search tool at the top right of the page to look for threads on scope/ rail mounting. Plenty has already been written on it.

KB
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  #10  
Old 06-14-2014, 08:47 PM
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Join Date: May 2012
Location: Lebanon County PA
Posts: 201
Re: 20 moa rail issues

Your original post said your scope has 38 moa total adjustment. Half of that is 19, and you say after sighting in you have 24 moa up available. Manufacturing tolerance stacking is the answer to your mystery. You did gain a few moa with your rail, but between the possible variations in machining your receiver, the rail, and the rings, plus the internals of your scope, and the harmonics of your barrel what you have is not outrageous. I suggest bedding the rail to eliminate any stress (look for a possible gap under the back end- with the screws tight in the front holes, no screws in the back at all. If a gap exists, use bedding compound to fill it.) Then get a set of Burris Zee rings with offset inserts for more elevation if you still need it.
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  #11  
Old 06-27-2014, 08:33 AM
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Join Date: Jan 2012
Posts: 41
Re: 20 moa rail issues

Well after lots of stuffing around, playing with the rail, checking bedding etc and finding no issues i gave up and replaced my scope and mounts with my trusty loupy vari x iii, 20 plus years and still strong.

Although i havent been out to the 800m range The scope is now zeroed at 300m (29mm group) with 34 moa of up left and only 28 needed. So im blaming the cheap scope.

As the original concept was to build a sub$1000 long range rifle, i guess i have failed, but i would value an old loupy at $600 maybe, making my investment
Rifle $459
Rail $48
Scope $600
Mount $0.00 with scope
Trigger job $50.00

Total $1157.00

Pretty close.

Rob
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  #12  
Old 07-04-2014, 10:06 AM
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Join Date: Jul 2007
Location: Arkansas (Home of Record)
Posts: 1,260
Re: 20 moa rail issues

You did the right thing and replaced the scope with a proven one. I am not a gear snob (can't afford to be) and understand the budget thing. But there is no way I would ever recommend somebody using a "cheap" scope's turrets for long range hunting. If you check the adjustments on "better" (read: more expensive) you might think twice about using them. I'm not saying a less expensive scope isn't capable, but having a reticle to use for holdover/hold off would be the way to go...if the scope will hold zero.
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  #13  
Old 07-04-2014, 10:30 AM
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Join Date: Nov 2008
Location: SW Montana
Posts: 4,460
Re: 20 moa rail issues

Slap a Super Sniper on it from SWFA and you can bring your budget back into line, I'm using a 10x and it has 140 MOA in it and I'm dialing 1500 yards with my 308 and 215 Bergers without any MOA in the base, it's a spectacular optic for $300 that has excellent turrets for dialing!

EGW bases are crap BUT sometimes they are the best you can get, I epoxy them to the action. I clean everything up and put a thin layer of JB weld on the rail then put shoe polish on the screw threads and tighten them up very slightly and let it set then I tighten up to spec and continue on.
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