375 cheytac finally finished!

Discussion in 'Extreme Long Range Hunting & Shooting (ELR)' started by pondskipper, Nov 30, 2018.

  1. pondskipper

    pondskipper Well-Known Member

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    Well, it’s been a long years wait gathering parts and pieces but Santa came a little early this year!

    Anyone have a good starting load for Lehigh 353 solids in Peterson brass with retumbo powder?
     

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  2. Bravo 4

    Bravo 4 Well-Known Member

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    You're gonna have to do better than that! Tell us more about that bad looking rig ya got there.
    Mines an improved version, so can't help with the load. I will say that so far I'm pretty happy with the Peterson brass, after I got it fire formed.
     
  3. pondskipper

    pondskipper Well-Known Member

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    1.6” Stiller tac408 repeater
    Cadex dual strike
    8 twist 32” 5c broughton
    Timney CE straight shoe bang switch
    Apa XX gen 2 fat bastard.
    Pretty standard stuff.
     
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  4. nmbarta

    nmbarta Well-Known Member

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    I run 133 grains of retumbo behind a 350 rmb with bertram brass.
    I would think that 125-128 would be a good place to start, but I don't know enough about that bullet to know that for sure.
    The bertram brass I have will hold one grain more powder than my peterson (unfired) when I fill them flush. I know this isn't the most accurate way of doing this, but it does tell me that the case capacity is less than 1% different.
    When I switch to the peterson brass, I'll back off to 128 to be safe, but I'm sure I'll end up back at 132-133.
    It's hard to find good info on this, so I'd thought I'd throw that out there, you can take it for what it's worth.
    Good luck with it, that's a beautiful rifle.
     
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  5. nmbarta

    nmbarta Well-Known Member

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    One other thing to note.
    I have noticed some variations between lots of retumbo, so If you haven't bought already, buy a bunch of the same lot so you don't have to mess with it when you run out of one, your going to burn a bunch of this stuff, but it's worth every penny! When your running this much powder, it can really change things.
     
  6. 300whisper

    300whisper Well-Known Member

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    Awesome rifle thanks for sharing!
     
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  7. Bravo 4

    Bravo 4 Well-Known Member

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    Switching from Bertram to Peterson I had to drop my powder charge down 2 grains to get the same velocity, this is with RL50.

    I have the same action with Baer bottom metal/mag...pretty standard stuff.:D Let me know how the Lehigh feeds from the mag. The Chinchagas I use for hunting will not, they are too sharp at the tip and try to dig in. The Hammer Hunters and CEB Lazers I’ve tried feed fine.
     
  8. nmbarta

    nmbarta Well-Known Member

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    Good to know.
    Which bullet are you running?
    Which improved version?
    I'm going to re-barrel next year and am leaning toward the Allen magnum.
     
  9. pondskipper

    pondskipper Well-Known Member

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    Awesome info guys, and I’ll definitely report back after the first range day.
     
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  10. Bravo 4

    Bravo 4 Well-Known Member

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    PM sent
     
  11. LR3

    LR3 Well-Known Member

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    I use 134 gr Retumbo for 350 gr SMK in my Snipetac and 141 gr ,for my Allen Magnum.
     
  12. sp6x6

    sp6x6 Well-Known Member

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    Really like the look of that .What did it finish at for weight scoped
     
  13. pondskipper

    pondskipper Well-Known Member

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    26.8lb with the atlas but will go up as soon as the all steel elite iron revolution comes in.
     
  14. osoh

    osoh Well-Known Member

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    Very nice rifle pondskipper, it should shoot well for you.

    Cheers
    Osoh
    JH