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Thread: Length of Case - Useful for Zeroing

  1. #1

    Length of Case - Useful for Zeroing

    I had a session on the range the other day - not overly successful as very hot, barrels hot, heat haze and thought scope had crapped out as it was shooting a bit too high. Cool of the day its all fine.

    But key thing was I wasn't quite how high it was shooting and of course didn't have a tape measure with me.

    In the cold light of two days later just sitting at my desk with the target in front of me and its much better than I thought. All rounds into an 1 1/2" group. And have discovered and will patent a very useful measuring stick.

    A Cartridge Case.

    Now a 243, 7-08 or 308 case is 1 1/2" (give or take a nats testicle) from the base to the shoulder and 2" or 50mm long

    So at 100 yds, go to your target, base of cartridge in middle of target, shoulder of case middle of group. Thats a 200 yd zero for most rifles.

    For those with longer cartridges

    7x57 - shoulder is at 1 3/4" and case length 2 1/4" or 57mm

    And the 7x65R (long 30-06 length) is 2" to the shoulder and 75mm long overall (a bit over 2 1/2").

    So there in solves the problem.

  2. #2
    Genius.
    I never make the same mistake twice.

    I make it five or six times.

    Just to be sure.


  3. #3
    Or just measure the width of your thumb...
    Last edited by Mungo; 12-05-2016 at 16:06.

  4. #4
    Quote Originally Posted by Mungo View Post
    Or just measure the width of your thumb...
    except i have a thin thumb and its less than 1" wide its not 1" from nuckle to tip either. this is where i went wrong - convinced myself i was shooting 3" high.

  5. #5
    The UK 10p, US 25 cents ("quarter"), and Euro 50 cent coins are all near as damn it 1" in diameter

  6. #6
    Quote Originally Posted by Heym SR20 View Post
    except i have a thin thumb and its less than 1" wide its not 1" from nuckle to tip either. this is where i went wrong - convinced myself i was shooting 3" high.
    Just measure the width of your thumb, or a finger. It doesn't matter what the actual measure is: it just gives you a reference value.

    So my thumb is 2cm wide, and I go from there.

  7. #7
    never have subscribed to this so much high at 100 is a 200 yd zero , just zero properly at the range you want then adjust accordingly with your turrets or aim off.
    Right where's those stones , I'll start !

  8. #8
    I'm inclined to agree with tackb. However if you want to zero high why not just use one of the print off targets that have a 1" squared background?

  9. #9
    Quote Originally Posted by tackb View Post
    never have subscribed to this so much high at 100 is a 200 yd zero , just zero properly at the range you want then adjust accordingly with your turrets or aim off.
    Tend to agree with Tackb. While I usually "zero" 1 1/2" high at 100 yards I always wonder what it actually is at 150/175/200 yards. I know what the ballistic charts say but? Next time I zero I will try some shots at more distant targets to get a better feel for the "actual" bullet drop at distance. I suppose it's all about confidence.

    Willie

  10. #10
    I used to zero an inch high at 100yd. Now I zero bang on at 100 and aim off at longer ranges- much more straightforward I think. 1" is quite a lot if neck shooting. I forgot about the 1" high and 'creased' an 80yd neck shot hind last year. Dropped on the spot but up and off a minute later. The experience changed my mind- bang on 100 yd zero keeps it simple, I think.

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