200gr SMK for .308 - Page 4

200gr SMK for .308

This is a discussion on 200gr SMK for .308 within the Reloading forums, part of the Sniping Related category; So for fun I put the bullet specs into the Berger calculator and the results are interesting Sent from my VS995 using Tapatalk...

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Thread: 200gr SMK for .308

  1. #31
    Senior Member Gunguy308's Avatar
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    So for fun I put the bullet specs into the Berger calculator and the results are interesting

    Sent from my VS995 using Tapatalk
    straightshooter1 likes this.

  2. #32
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by Gunguy308 View Post
    So for fun I put the bullet specs into the Berger calculator and the results are interesting

    Sent from my VS995 using Tapatalk

    Yes, interesting . . .

    When I plug in the altitudes that I shoot at (like between 800 and 1700 ft) that number drops to 1.47 - 1.48 (Marginal Stability) and a minimum twist recommend of 9.75".

    Guess I'd have to use these for high altitude shooting.
    Last edited by straightshooter1; 05-16-2019 at 04:18 PM.

  3. #33
    Senior Member Gunguy308's Avatar
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    Quote Originally Posted by straightshooter1 View Post
    Yes, interesting . . .

    When I plug in the altitudes that I shoot at (like between 800 and 1700 ft) that number drops to 1.47 - 1.48 (Marginal Stability) and a minimum twist recommend of 9.75".

    Guess I'd have to use these for high altitude shooting.
    I dont think the calculator is accounting for the bearing surface being short compared to overall length of the projectile. I'll be shooting these out to 800 sunday, so I will have more data then.

    Sent from my VS995 using Tapatalk

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  5. #34
    Senior Member Gunguy308's Avatar
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    Shot the 200gr out to 895 yards and they are dead on.

    Sent from my VS995 using Tapatalk

  6. #35
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    Gunguy do you have access to go out to 1500yds? Just out of curiosity, on the 895, what was the wind value and speed you were dealing with, and your wind hold in your firing solution? Did you use a Kestral or estimate?

  7. #36
    Senior Member Gunguy308's Avatar
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    Quote Originally Posted by Martino1 View Post
    Gunguy do you have access to go out to 1500yds? Just out of curiosity, on the 895, what was the wind value and speed you were dealing with, and your wind hold in your firing solution? Did you use a Kestral or estimate?
    Wind at firing position was different than target. Wind hold was .5 to 1 depending on wind, which is 5-9mph, the mirage made it difficult to see the target clearly. My wind corrections are consistently .5mil less than my 175gr SMK at 895 yards. I wish I had access to 1500 yards. I may get a chance to send a few at 1350 next month. But so far the drop data is spot on.

    Sent from my VS995 using Tapatalk
    Last edited by Gunguy308; 05-19-2019 at 10:13 PM.

  8. #37
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    I'll pull some numbers from my load data last fall. I was developing loads for 195 SMK, Rem 700, 7 twist out of 20" barrel at 500m. My elevation is about 8500'. Windage can be a challenge at times on the gulch range. With Spring in bloom up here it's time to head for the long range (quad or horse access only). My brother wants to see how his new 6.5 CM compares to the 308. I figure that range is 1000 yd. Guess I'll have to measure this year.
    tom

  9. #38
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    Quote Originally Posted by Gunguy308 View Post
    Wind at firing position was different than target. Wind hold was .5 to 1 depending on wind, which is 5-9mph, the mirage made it difficult to see the target clearly. My wind corrections are consistently .5mil less than my 175gr SMK at 895 yards. I wish I had access to 1500 yards. I may get a chance to send a few at 1350 next month. But so far the drop data is spot on.

    Sent from my VS995 using Tapatalk
    Yeah I pick that up when they let the grass grow at the range I go to. My range goes to 1000 and I've seen wind swirling where its going one way at your firing position and another at the target. They don't have flags so you have to try to use mirage at the target and the wind at your firing position to gauge the direction (value) and speed of wind when the grass is cut. I'm not good reading mirage yet but I'm working on it.. I do use a Kestral to practice estimating wind speed. This seems to be a rapidly perishable skill. I get good at calling it if I practice and if I don't do it for a while, I'm back to square one. Probably cause I'm getting old.

  10. #39
    Senior Member Gunguy308's Avatar
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    I went out shooting today and found a cliff face at 1300 yards to poke at. Drop was dead on, 1300 yards 15.1 Mils.

    Sent from my VS995 using Tapatalk

  11. #40
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    Quote Originally Posted by Gunguy308 View Post
    I went out shooting today and found a cliff face at 1300 yards to poke at. Drop was dead on, 1300 yards 15.1 Mils.

    Sent from my VS995 using Tapatalk
    I guess I bought my last box of 175's

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