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scope base for 243

Discussion in 'Rifle Country' started by crazymike77, Jan 2, 2017.

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  1. crazymike77

    crazymike77 Member

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    Dec 27, 2016
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    I have been getting into long range shooting and have been using a Remington 700 .243 that i have been upgrading as I go along. Right now I have a 0 moa base thats on the cheap side and i think its time I upgrade it. I have been going back and forth on either s 20 moa or a 0 moa. I am shooting a 95g bullet that travels at about 2950fps. the range I shoot at the most has a max range of 550 yard but I do want to move out to 1000y yards at some point. I have a vortex pst 6-24 and with my 0 moa base I have about 25 moa travel up, so I am worried that I will be at the max end of upper travel if I go with a 20 moa base but it would make it a bit easier for 1000 yard shots down the road. I would like to keep my 100 yard zero as it keeps the math simple.

    Any advice? Are there any problems if I do wind corrections if i am on the upper end of the turret? Not that I do much wind corrections at 100 yard but at 300 yards I might. Any bases I should avoid or any bases I should keep my eye open for?.
     
  2. Bart B.

    Bart B. Member

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    May 20, 2008
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    Location:
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    Yes, when an E or W adjustment is near a mechanical limit, the inside tube of the scope is close to the outer tube the mount rings clamp onto. Adjustment range is typically limited.

    Those PST 6-24 models have about 65 MOA elevation adjustment range. I don't know how much adjustment range there is from the scopes axis to the 100-yd. zero settings its at. All the scopes I've checked have a much greater adjustment range up and right from their axis than left and down. I therefore think your rings axis is a long way off from the rifle barrels bore axis. That happens when the barrel thread axis in the receiver are not in line with the receiver axis the scope mount bases are aligned to.

    The first thing to do is count then write down the clicks to mechanical limits down for elevation and left for windage, then title them "100 yd zero's from down-left stops."

    If you know how to zero the scope adjustments by twisting it in V cuts in a cardboard box, that's the second thing you should do. If not, let me know. Once the adjustments are at the optical and mechanical center ad determined by the V cut and twist process, count and record on paper the clicks down and left from that point then title them scope adjustment zero's from down-left stops.

    Third, compare both sets of zero's. If everything is perfect and the scope ring axis is parallel to the bore axis, if you check the bore sight of the bore to line of sight of the scope, they're both pointing/aligned to the same place. If not, either the rifle's receiver or the scope bases or rings axis isn't aligned with the bore axis.

    There are scope mounts that can be adjusted to put the scope axis parallel to or below the bore axis. Even if a 20 MOA base is put on the receiver, any misalignment between receiver and barrel will be transferred to the angled rail. Talking with the man who made the first angled rails back in the 1960's enlightened me to all sorts of issues one has to deal with when all the parts involved are not aligned with each other.

    These rings and bases are excellent to mount the scope with a down angle like rails do. But don't interfere with charging internal box magazines like most rails do. With a .020" offset insert in both rings 6 inches apart, that'll give about 25 MOA offset of the scope axis to the scope base/receiver axis.

    http://www.burrisoptics.com/signature-rings

    From Burris' web site:
     
    Last edited: Jan 2, 2017
  3. Ks5shooter

    Ks5shooter Member

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    I use LaRue they are the best IMHO . Contact LaRue with all info you posted here,and their experts will recommend the best mount for your application. They are very knowledgeable and have never let me down. Shooting at the yardages you are ,you need things right.

    http://www.larue.com/
     
  4. Bart B.

    Bart B. Member

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    May 20, 2008
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    3,162
    Location:
    Colorado
    Do LaRue rings have inserts to align scope axes to bore axes?
     
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