Drats!!

Discussion in 'Long Range Hunting & Shooting' started by Clem Bronkoski, Sep 16, 2019.


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  1. Clem Bronkoski

    Clem Bronkoski Well-Known Member

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    Jun 23, 2019
    I finally got out to sight in my b-14 HMR and couldn't do it. I had a 20 MOA rail on it and at the 100 yard mark I couldn't dial down the scope far enough. At the farthest down I was still 4 Mils high at 100 yds. (about 14"). This was also serving as a barrel break in so just for giggles I used my 4 mil dot and was punching them into the 1" bull with a few outside (crappy 125 gr Winchester range ammo that I got just for the brass.
    When I got home I installed a set of Weaver bases and reloaded the empty cases with H4350 and Hornady 143 gr ELDX bullets. I started at 39.5 gr up to 40.5 gr in .5 gr increments.
    Will keep y'all posted.
     
  2. Remmy700

    Remmy700 Well-Known Member LRH Team Member

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    What scope? That don’t seem right at all brother.
     
  3. ShtrRdy

    ShtrRdy Well-Known Member

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    If your scope has a zero stop it is very likely blocking your ability to dial down enough.
     
    Barrelnut, FEENIX, the hunter and 3 others like this.
  4. Remmy700

    Remmy700 Well-Known Member LRH Team Member

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    Feed us some info and we will Sherlock Holmes this pile of stinkey brown stuff that comes from #2 hole! Heck yeah no rule 4 violation here folks!
     
  5. Mach 1

    Mach 1 Well-Known Member

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    Yea something is off if you can’t dope down to sight in at 100 yards. Sounds like you have a 40 moa base rather than a 20moa base.
     
  6. Clem Bronkoski

    Clem Bronkoski Well-Known Member

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    That could very well be. The package did say 20 MOA rail. Does anyone have the dimensional difference between the front and rear of the rail (700 SA)? I'm going to go check it out. And yes my scope does have a zero stop - Mueller.
     
  7. Clem Bronkoski

    Clem Bronkoski Well-Known Member

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    I just did some measuring of my rail. The front of the rail has a height of. 0.262" and the rear measures 0.409". That's a difference of 0.147". That seems like an awful lot of difference for a 5" long rail for 20 MOA. By my calculations that's about a 50 MOA rail!!!
    I just looked at the rifle and that difference in height has to account for the difference in the receiver height in front and in back of the bolt. The rail is also stamped 20 MOA Remington 700 SA. The B-14 specs call for 700 bases but I bet there is a difference in the receivers.
     
    Last edited: Sep 16, 2019
  8. Remmy700

    Remmy700 Well-Known Member LRH Team Member

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    I have messed with several B-14s and 700 20 moa rails have done just fine. I can measure them when I get home in front and rear but I have never had an issue at all and from playing with turrets they all have been around the 20 moa mark.
     
  9. Schnyd112

    Schnyd112 Well-Known Member

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    It’s your zero stop. Stop overthinking it. If you want to check, turn the turret all the way down. Then count the clicks all the way up. Almost guaranteed the zero stop is set about halfway through the total internal adjustment. It needs to be adjusted when you sight in.
     
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  10. SealTeam4

    SealTeam4 Well-Known Member

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    My 20moa rail has a height difference of .049” front to back about 5.5” apart
     
  11. Clem Bronkoski

    Clem Bronkoski Well-Known Member

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    Nope - the turret is down all the way. My rail difference between front and rear is .147". I called EGW and talked to Zach in technical asking his what the difference was and I was right on the money.
    He told me for out to 500 -600 yards a flat rail is fine. Beyond that he recommends a 20 MOA rail and sight in for 200 yards. He also said that if I used a 10 MOA rail and I was 14" above my POA at 100 yards with the 20 MOA I would be about 4" high 100. With that being the case, I could use a 10 MOA rail and use the first MIL dot above my center reticle and be almost dead on at 100 (3.6").
     
    Last edited: Sep 18, 2019
  12. huntsman22

    huntsman22 Well-Known Member

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    How much total ele does your scope have? How much can you actually count? I'd bet it IS your zero stop and you don't know how to tell. I've got lots of rifles with 20moa bases and 100 yd zero's......
     
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  13. JLM8401

    JLM8401 Active Member

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    So if you do the math. A 20MOA Rail At 5 inches should be .029 not .147
    20 moa is 20.94" @ 100 yards
    20.94" / 100 = 0.2094" per yard
    0.2094 / 3 = 0.0698" per foot
    0.0698 / 12 is 0.0058 per inch
    0.0058 * 5 is 0.0290'' end to end over 5 inches

    Or from the Machinist Handbook

    Or 20 MOA over 5 "
    20 MOA is 1/3 of 1 degree over 5 inches is
    20MOA(0.33333) x pi /180 x 5 inches = 0.0290"
     
    Last edited: Sep 18, 2019
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  14. lancetkenyon

    lancetkenyon Well-Known Member

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    R700 footprint actions are lower in the back of the receiver than the front. Even 0MOA rails differ in height from front to back. I have mounted 20MOA bases/scopes on a lot of R700 footprint actions, from cheap to top tier, and never had a problem getting a 100 yard zero.

    Another vote for 0 stop issue.
     
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