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  1. #1

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    Chronograph data thoughts???

    First 3 shots were 3 to 5 minutes apart. Because they were identical I thought my chronograph might be bad so I put three in the mag and fired them very quickly followed by 3 more in the mag then quick for 3 more. Last one was a short break then 1 to fill out the 10 shot test.

    Groups

    1) 3 in virtually the same hole
    2) 3 in .25" clover leaf
    3) 3 same as above
    Last shot was raining so hard I just let it rip through the center of the chronograph.

    Results are below. I would love any thoughts or input. 1-3 seems too good to be true. It's a hunting rifle so first shot is most important.

    Kimber Mountain Rifle with pencil thin barrel


    Created: 12-16-2018 01:58:05 PM
    Description: 300 Win Mag
    Notes 1: Bullet- Barnes TSX 180 gr
    Notes 2: Powder- Magnum
    Distance to Chrono (FT): 10.00
    Ballistic Coefficient: 0.453
    Bullet Weight (gr): 180.000
    Altitude (FT): 0.0
    Temp: N/A
    BP: N/A
    Shots
    # FPS FT-LBS PF
    10 2946 3469.39 530.28
    9 2959 3500.08 532.62
    8 2956 3492.99 532.08
    7 2949 3476.46 530.82
    6 2923 3415.43 526.14
    5 2923 3415.43 526.14
    4 2927 3424.79 526.86
    3 2910 3385.12 523.80
    2 2910 3385.12 523.80
    1 2910 3385.12 523.80
    Average: 2931.30
    StdDev: 19.51
    Min: 2910
    Max: 2959
    Spread: 49
    True MV: 2938.65
    Shots/sec: 0.01
    Group Size (IN): 0.00

  2. #2

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    Anone seen identical chrony results in first 3 shots like that?

  3. #3
    JeffreyDeGraff's Avatar
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    I never have.


    JTD

  4. #4

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    Quote Originally Posted by JeffreyDeGraff View Post
    I never have.


    JTD
    This rifle is taking all the fun out of load development. Everything I feed it it makes nice little cloverleaf holes

    Sent from my SAMSUNG-SM-G890A using Tapatalk

  5. #5
    JeffreyDeGraff's Avatar
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    Quote Originally Posted by 4jorgies View Post
    This rifle is taking all the fun out of load development. Everything I feed it it makes nice little cloverleaf holes

    Sent from my SAMSUNG-SM-G890A using Tapatalk
    Ha! That is a terrible thing.


    JTD

  6. #6

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    Quote Originally Posted by JeffreyDeGraff View Post
    Ha! That is a terrible thing.


    JTD
    Worst group it ever produced was the cheapest factory ammo I could find for the "barrel break in" 20 rounds 1.5"

    Shoot one clean and let cool then shoot another for all 20 rounds.

    Sent from my SAMSUNG-SM-G890A using Tapatalk

  7. #7
    JeffreyDeGraff's Avatar
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    Quote Originally Posted by 4jorgies View Post
    Worst group it ever produced was the cheapest factory ammo I could find for the "barrel break in" 20 rounds 1.5"

    Shoot one clean and let cool then shoot another for all 20 rounds.

    Sent from my SAMSUNG-SM-G890A using Tapatalk
    I bet if you shot that same ammo again, it would group better.


    JTD

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