200gr SMK for .308 - Page 2

200gr SMK for .308

This is a discussion on 200gr SMK for .308 within the Reloading forums, part of the Sniping Related category; Made 50 more at 39.3gr to test out. Sent from my VS995 using Tapatalk...

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Thread: 200gr SMK for .308

  1. #11
    Senior Member Gunguy308's Avatar
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    Made 50 more at 39.3gr to test out.

    Sent from my VS995 using Tapatalk

  2. #12
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by SatCong View Post
    Don't know if you ever read this before.
    https://www.accurateshooter.com/ball...or-long-range/
    I've read something like it a couple years ago. Good article and it mentions something I have some concern over, especially for a .308. . . Recoil. I have a hard enough time managing it.


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  3. #13
    Senior Member Gunguy308's Avatar
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    I shot them out to 300 yards today, nice clean holes in paper, also shot steel and its basically point and click. Its dead on.

    Sent from my VS995 using Tapatalk

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  5. #14
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by Gunguy308 View Post
    I shot them out to 300 yards today, nice clean holes in paper, also shot steel and its basically point and click. Its dead on.

    Sent from my VS995 using Tapatalk
    Did you happen to measure the base to ojive for any of them?

    Someone reported they got a box of 100 of these and found a variance of +/- .035, which was similar to a batch of 175 SMK's that I got a while back that I used to test the effect of the difference in bearing surface length.

  6. #15
    Senior Member Gunguy308's Avatar
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    Just measured 10 and .714 +/- .001
    I have not seen any velocity abnormalities

    Sent from my VS995 using Tapatalk

  7. #16
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    Quote Originally Posted by Gunguy308 View Post
    Here is the 175gr SMK and 200gr SMK

    Sent from my VS995 using Tapatalk
    Dang that's a long and skinny pill. I notice the shallow taper of the boat tail on the skinny.. I'll be interested to see if you can actually reach out to 1500-1600yds with precision. My 308 barrel is a 1/10 on my DT. Let me know how the LD tests come out. I may have to try these heavy SMK's in my 308. I thought 175SMK's were it for 308..

  8. #17
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by Gunguy308 View Post
    Just measured 10 and .714 +/- .001
    I have not seen any velocity abnormalities
    Thanks. +/- .001 is great . . . and reassuring.

    So, it looks like your loads are doing great . . . at least for these shorter ranges.

    With the 1:10 twist, the length of these bullets still makes me wonder if they'll remain stable out to 1,000+ yds. With the MV you got seems to be asking a lot of a 1:10 barrel, but could be right there on the edge???

  9. #18
    Senior Member Gunguy308's Avatar
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    I have no pressure signs and plenty of room for more powder. Gonna go out to 800 yards and see how accurat they are. Gonna have steel and cardboard to see if they are still heading in straight

    Sent from my VS995 using Tapatalk

  10. #19
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by Gunguy308 View Post
    I have no pressure signs and plenty of room for more powder. Gonna go out to 800 yards and see how accurat they are. Gonna have steel and cardboard to see if they are still heading in straight

    Yeah, I wouldn't expect you'd see any pressure signs as I look at some QuickLoad numbers saying pressure is around 46,110 with 39.3 gr of Varget filling the brass to 94% of capacity.

    So . . . some food for thought: Compare that load to one of 43.5 gr of Varget brings the pressure to right close to SAAMI max of 62,000 psi with the case being 104% filled (given the same seating you've mentioned that you're using). And the calculated velocity then is at 2680 fps. That's most likely not where you'd want to be at. 41.9 gr of Varget would but the fill at 100% with a pressure of around 55,250 psi and an MV of 2590 (and this is all run at a temperature at 85°F).

    Note: Because this software doesn't have this new bullet in its data base, I've modified the information from the old 200 gr SMK, which should give me a somewhat good representation of what we're dealing with.


    BTW: Given the design of this bullet, have you changed anything in your seating die to accommodate?
    Last edited by straightshooter1; 05-12-2019 at 09:58 PM.

  11. #20
    Senior Member Gunguy308's Avatar
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    I have not changed my seating die, since its not a compressed load im not getting and deformation of the bullet.

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