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  1. #11
    Thanks Broz,

    I was typing as you posted, I'll report my findings after I run the test.

    I would also like to say that your success with 300 win mag is what inspired me to build this rifle.
    Stiller predator action
    Broughton 5.5 at 28.5"
    Manners T5A


    Sent from my iPhone using Tapatalk 2

  2. #12
    Quote Originally Posted by Texas Edge View Post
    Sam,

    On my 300 win mag I have a nightforce with a 30mm tube, sight height measures approximately 2.1", however with all the information plunged into AB my drop is about 3/4 min low. I have temporarily corrected this by changing the sight height to 1" and my dope is spot on all the way to 1050 yds. To add to this I am using published BC for the Berger 215's running at 2947 fps measured with a magneto speed. I have checked the velocity many times over the last few months and can confirm its accuracy. ES is less than 15 fps and the rifle easily shoots sub .5 min groups if I do my part.

    Actual drop at 1000yds is 24 min
    Correction from AB with 2.1 sight height is 23.25 min.
    Not sure where I'm going wrong but any help would be appreciated.

    Thanks,
    Jake


    Sent from my iPhone using Tapatalk 2
    The number one thing I see when someone is having a problem verifying their drops, is a faulty zero. The number two problem is atmospheric data not entered correctly or not updated (temp).

    It really pays to get that zero perfect, where you can fire a shot into a 1/2" circle every time. Parallax has to be perfect, form and trigger press has to be perfect, etc.

    The 1/4 MOAs from zero offset, atmospherics, etc. add up quickly. You can compensate for them by changing parameters in your program, but it will bite you if you change something down the road and don't take it out. What I always strive for is complete trust in my equipment and ballistic solver, so if I miss, it will truly be a surprise!
    Turning rocks into gravel 300 grains at a time!

  3. #13
    LRO Owner ~ Review Editor ~ Long Range Hunting Specialist Broz's Avatar
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    Apr 2013
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    At the foot of the Big Belt Mountains near Townsend Montana
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    Quote Originally Posted by Texas Edge View Post
    Thanks Broz,

    I was typing as you posted, I'll report my findings after I run the test.

    I would also like to say that your success with 300 win mag is what inspired me to build this rifle.
    Stiller predator action
    Broughton 5.5 at 28.5"
    Manners T5A


    Sent from my iPhone using Tapatalk 2
    Sounds like a sweet rifle. By the way, I am using the off the box G7 BC for the 215's in my AB app and it is working very well.

    Jeff

  4. #14
    Senior Member
    Join Date
    Jun 2013
    Location
    Canyon Ferry, MT
    Posts
    370
    I' ve always just measured the front receiver ring on a 700, from the blow hole, up to center scope tube.

    Did a comparison just now using Sam's method measuring from center of cocking piece, to center of ocular.

    I had 1.85" at the front ring, and 1.90" at the rear end. I'd say that comes out pretty close to where it should be considering the base in a 45 MOA rail.

    Good video, thanks for sharing, knowledge is always good.
    Shane

  5. #15
    AWESOME video, learn something new everytime I visit this web-site.

    Thx

    Scratch

  6. #16
    Senior Member
    Join Date
    Jan 2017
    Location
    Hill Country Texas
    Posts
    123

    Since we are talking about Sight height, how does a higher sight height affect your data if it is accounted for in the app? I realize lower is better but what parameters will it being taller effect?
    James

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