My 7saum by Hawk Hill Custom

Discussion in 'Gun Photos' started by trebark, May 12, 2014.

  1. trebark

    trebark Well-Known Member

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    My new 7saum has arrived and I'm excited to share some pics.

    This rifle will be my long range tactical rifle (for matches where a stage(s) may be 1000yards and farther). It will also spend some time in the field hunting deer and groundhogs.

    Here are the specs:

    Action: Blueprinted Remington 700
    Caliber: 7saum
    Barrel: 28" fluted, heavy barrel, 1:8 twist to shoot 180 and 195grain bullets, four port Muscle Brake and Holland recoil lug
    Finish: McMillan Gray cerakote.
    Stock: McMillan A3 (50% brown, 25% black, 25% gray - trebark colors!) with adjustable cheekpiece. Pillar bedded.
    Trigger: Jewell trigger tuned to 18oz. - it breaks like glass!
    Optics: Leupold MK4 8.5-25x50 with M5 turrets and TMR reticle mounted in Burris Signature Rings and 20moa rail.

    Weight: 15lbs unloaded

    This rifle started life as http://www.longrangehunting.com/forums/f53/my-300rum-mcr-70809/ The conversion to 7saum was done by Shawn Burkholder with Hawk Hill Custom - Hawk Hill Custom. I highly recommend him to you.

    Initial load development has shown great accuracy potential (.5moa or better) while sending 180grain Berger Hybrids at 2900+ with expectations of getting them going 3000fps. I'll post shooting results soon. In the mean time, here's a few pics of my new stick. Let me know what you think.

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    This rifle is a visual twin of http://www.longrangehunting.com/forums/f53/my-260-mcr-59628/index11.html#post952416. (7saum in rear with four port brake)

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  2. trucraft

    trucraft Well-Known Member

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    very nice indeed.gun)

    Love the Mc marble colouring and that brake looks sweet with that barrel contour.
    What powder are you using?

    You gotta love the SAUM's.
    Though made a school boy error shooting mine yesterday, not shouldering it properly and split my eyebrow open.
     

  3. trebark

    trebark Well-Known Member

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    Thank you for the nice comment.

    As for reloading, I am currently working with Retumbo. Will also do some testing with H1000. Whichever produces consistent velocities will be the winner.
     
  4. ramrod79

    ramrod79 Well-Known Member

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    Hey Trebark that is a nice pair of rigs you have ,and if you ever get tired of shooting them send them way up north ill put some brass through them for ya . Good luck with your load development ,and I hope they shoot as good as they look, looking forward to seeing some targets.
     
  5. WSMDRT

    WSMDRT Well-Known Member

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    Looks great now that they are both box mag harder to tell them apart. Hope our sevens live up to the numbers, you'll have me by 50-100 for with your long action. Can't wait to get my 260 back. It will be like having a daily driver corvette and also having a full blown race car in the garage.
     
  6. trebark

    trebark Well-Known Member

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    Excellent analogy! You can always tell them apart by counting the vents in the brakes.
     
  7. trucraft

    trucraft Well-Known Member

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    How's this rig performing for you now buddy, have you settled on a load?
    Have you drawn blood yet?
     
  8. ukenout

    ukenout Well-Known Member

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    Great looking rig. I am having a REM 700 rebarreled into a 7saum. Plan will be to load and use 175 lab or 180 burgers. Just curious to see if you've come up with a load yet.
     
  9. Swgreen

    Swgreen Well-Known Member

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    Sweet rifles
     
  10. trebark

    trebark Well-Known Member

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    Thank you.

    Are any of your rifle(s) posted?
     
  11. jonthomps

    jonthomps Well-Known Member

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    Nice! With a 28" tube you should be getting great velocities.
     
  12. trebark

    trebark Well-Known Member

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    After some struggles resolving a mystery, my big cannon rifle is finally performing well!

    The mystery was that no matter what I tried, I could not get a load to shoot faster than 2750 without showing pressure signs. The resolution turned out to lap the barrel a few more strokes because the barrel was cut exactly .2840 and it needed to be .2841. Seems hard to believe but .0001 was the difference between 2750fps and 3000fps.

    With the mystery solved, the rifle has performed very well. It now shoots the 180grain Berger Hybrids at 3000fps into .5moa or better groups. Here's the load data:

    Bullet: 180grain Berger Hybrid
    Powder: 66grains Retumbo
    Brass: Nosler
    Primer: F215M

    Have shot the rifle out to 625 yards so far. It is amazing! Shooting those 180 bergers really fast, they just slip threw the wind! Looking forward to deer season when it opens up in mid-November.
     
  13. mountainman56

    mountainman56 Well-Known Member

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    Well that's done right isn't it. Fine lookin rig for sure.
     
  14. graybullet

    graybullet Active Member

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    What kind of bottom metal did you go with?