Len's new 7 LRM - first day at the range

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Len Backus, Oct 7, 2012.

  1. Len Backus

    Len Backus Administrator Staff Member

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    In another similar 7 LRM thread yesterday a guy said:

    Not wanting to hijack that thread I am starting this one of my own.

    We just finished my own Long Range Rifles, LLC bolt action gun chambered in 7LRM last Thursday.

    I took it to the range this afternoon to get it sighted in at 100 yards.

    First I shot a 5/8 inch two shot fouling group.

    Then after adjusting my scope ... a 1/2 inch two shot group.

    ... then a 1/4 inch two shot group.

    And finally a 3/8 inch three shot group as I ended up just about where I wanted to be on the 100 yard target target.
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    7LRM-sight-in.jpg
    .

    Then I backed up to 600 yards and shot a 1.30 inch three shot group. (0.21 moa)
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    Len-7LRM-600.jpg


    All of the above were the first shots fired and no cleaning was done at all so far.

    All from a bench using Caldwell bipod with installed bipod lock and LRH Rear Shooting Bag.

    72 gr H1000
    180 gr Berger VLD
    OAL of 3.360

    Not sure of the velocity as the sun's low angle was messing with my chrono.

    This is probably the easiest load work up seesion I've ever had. I just used the load suggested to me by Mike and Aaron Davidson of Gunwerks.

    BINGO!

    And remember --- DRIVE CAREFULLY :):):)
     
  2. Broz

    Broz Well-Known Member

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    I am guessing 3050 to 3100 from a 26" Very close to the same load as I use in the 7mm-300 wins.

    Nice going. gun)

    Jeff
     

  3. Coyboy

    Coyboy Well-Known Member

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    Well frankly I'm a little disappointed...

    No mention of the new muzzle brake that you are using on that rifle! The Mini Magnum muscle Brake.
     
  4. Len Backus

    Len Backus Administrator Staff Member

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    Well, now that you brought it up... :)

    I was actually amazed that I could so easily spot my hits at 600 yards.

    This rifle is the lightest I've ever had for such a powerful cartridge. I think I could get by with the next lighter profile barrel quite well.

    Very impressed.
     
    Last edited: Dec 25, 2012
  5. 4bycamper

    4bycamper Well-Known Member

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    Smokin' hot 600 yd group.

    What twist and barrel weight for 180 vld do you like?
     
  6. Len Backus

    Len Backus Administrator Staff Member

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    This is a #5 Brux with 9 twist.
     
  7. IdahoCTD

    IdahoCTD Well-Known Member

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    I have 50+ rounds through my 6.5-300wm that I just built and have only cleaned it once at about 20 rounds. I didn't notice a difference in the amount of time to clean or the accuracy compared to "breaking in" a barrel. Right now I have 35+ rounds without cleaning and it just shot a 1.15" group at 300yds.
     
  8. webs

    webs Well-Known Member

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    Len can you post pictures of the rifle and full specs?
     
  9. zuba

    zuba Well-Known Member

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    Im curious to see how the velocity compares to your 7 Dakotas. The lrm might be a better option for me :)
     
  10. bkondeff

    bkondeff Well-Known Member

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    Did Aaron cut the chamber, or do you have a reamer?

    Which action did you use?
     
  11. Len Backus

    Len Backus Administrator Staff Member

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    I bought a reamer from Aaron.

    Stiller Predator action

    They said to expect 3050 to 3075 fps. I won't really know until I get about 50 more rounds through it. Seems that barrels speed up until that round count is reached.
     
  12. SPR123

    SPR123 Member

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    Great post, I am building one now. Waiting on the reamer from Aaron and the bolt from Dave Kiff. Building mine on a Trued Rem 700 LA, PTG 1 piece bolt and a 1-8 twist # 5 Shilen barrel. Len are you happy with the H1000 and/or are you going to try Retumbo as well? I would like to see some pics of the gun as well!

    Ryan
     
  13. ADMIN

    ADMIN Administrator

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    Ryan

    I will stick with H1000
     
  14. Time Killer

    Time Killer Well-Known Member

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    Maybe you should consider changing your ruler to read the same : "School's out"
    Nice shooting, Len!