Range Report: 6.5x47 Lapua, 140 gr bullets and Rel 17

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Alan Griffith, May 13, 2010.

  1. Alan Griffith

    Alan Griffith Well-Known Member

    Messages:
    630
    Joined:
    Aug 22, 2005
    Ran a little test today. I'm having a Lt weight hunting rifle built by Chris Matthews of Longshot Rifles http://www.longshotriflesllc.com/ , possibly in 6.5x47 Lapua or 260 Rem AI and wanted to see what a 140 gr bullet with Rel 17 would do. So, I took my tactical rifle, also built by Chris, and ran a pressure ladder with it.

    Surgeon 591 short action
    Krieger 26" 1:8.5 twist, SS, MTU contour
    1.5 AICS stock
    NF NXS 5.5-22x50 w/ NP-R1 reticle
    Shilen 2lb trigger

    6.5x47 Lapua brass w/ 5x firings
    Berger 140 VLD Hunting
    Nosler 140 Accubond

    37 gr to 43 gr in .5 gr increments (42.5 gr w/ Accubond due to mucho compression)
    CCI 450 primer
    Throat started life @ .105" long but after 700+ rounds is now .161" long.

    Temp 57 deg F
    Baro 24.6
    Chrono = CED M2 set 15' from muzzle

    140 VLD's were seated .010" into the lands with OAL being 2.797".

    140 Accubond's were seated @ the lands with OAL being 2.698". Had to turn down my Redding comp seater about .005" for each successive round after 39.5 gr.

    37 2521
    37.5 2533
    38 2587
    38.5 2614
    39 2647
    39.5 2682
    40 2707
    40.5 2770
    41 2814 ? ejector mark
    41.5 2863 Light ejec
    42 2910 Light ejec
    42.5 2922 ejec
    43 2962 ejec/bolt lift

    Pressure ladder test for Rel 17
    Nosler 140 Accubond
    37 2513
    37.5 2537
    38 2569
    38.5 2612
    39 2634
    39.5 2682
    40 2716 ?ejec
    40.5 2760
    41 2770
    41.5 2834 Lt ejec
    42 2863 ejec
    42.5 2910 ejec

    I was pleasantly surprised @ the vel obtained in the little x47mm case with Rel 17. I think I'll hunt with it instead of going 260 Rem AI.

    Enjoy!

    Alan
     
    Last edited: May 14, 2010
  2. Savagebien

    Savagebien Well-Known Member

    Messages:
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    Mar 11, 2008
    Glad to see a good write up like this. I was wondering more about what this cartridge would do with 140's most ppl just shoot 130s it seems. Looks like you're getting nice velocity, and I'd probably use a longer barrel if I build one anyway.