7mm-300 Winchester Magnum Experience?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by nyrifleman, Jun 3, 2010.

  1. nyrifleman

    nyrifleman Well-Known Member

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    Necking the .300 Win Mag down to 7mm has me intrigued. I googled this wildcat, McWhorter rifles seems to like it.

    What I'm looking for is any real life experiences with this round.

    I'm considering a build on a M-70 Classic Stainless with a 24" barrel.
     
  2. jbroadnax

    jbroadnax Well-Known Member

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    >100fps faster than a 7mm wby. and a whole lot cheaper to shoot. Not quite the performer of the 7mm ultra but much more efficient and less recoil. McWhorters told me they are getting 3150fps out of 180 Bergers. I have already ordered the action. McWhorter will be building mine as soon as all the parts come in.
     

  3. nyrifleman

    nyrifleman Well-Known Member

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    With what length barrel did McWhorter quote those velocities?
     
  4. Broz

    Broz Well-Known Member

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  5. jbroadnax

    jbroadnax Well-Known Member

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    Allan at McWhorter Rifles told me he was getting 3150 with a 26" barrel.
     
    Last edited: Jun 3, 2010
  6. nyrifleman

    nyrifleman Well-Known Member

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  7. Broz

    Broz Well-Known Member

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    As close as I can tell with my Chrony and using what matches the drops in my exbl program I am getting 3175 ~3180 with 180 Bergers and a 28 1/2" barrel.

    Jeff
     
  8. Broz

    Broz Well-Known Member

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  9. nyrifleman

    nyrifleman Well-Known Member

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  10. Broz

    Broz Well-Known Member

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    No problem...:D

    I am looking for a Broughton barrel now to build another one of these. I hate to think it would replace the love I have for a 300 win, but it sure has me thinking.

    Jeff
     
  11. nyrifleman

    nyrifleman Well-Known Member

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    Jeff,

    Haven't had time yet to read the whole thread, looking forward to it.

    In the meantime, what's the COAL of your loads?
     
  12. Broz

    Broz Well-Known Member

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    Head of case to O-give of bullet is 2.950" Not sure of the oal right now as I dont have that with me. But these will fit in a standard rem magnum mag box. I am .115" off the lands as the reamer had some freebore.

    Jeff
     
  13. smack

    smack Well-Known Member

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    What size bushing are you guys using for the winchester unturned .300 Win mag brass for sizing. I have a 7mm-300 Variant called a 7.21 Sage it is almost identical to the Valkeri print in this thread with the acceptation of a 35 degree shoulder. I had mine done last year, reamer that is. I'm just getting a barrel chambered now.