Idaho legal 338 Allen Mag testing

Discussion in 'Equipment Discussions' started by Shawn Carlock, Dec 4, 2006.

  1. Shawn Carlock

    Shawn Carlock Sponsor

    Messages:
    1,897
    Joined:
    Jun 11, 2007
    I just finished roughing out a 15.8 lb 338 AM for a customer here localy. Here are the specs and results:

    BAT 8.5" action
    DE recoil lug (makes it look like a giant 700)
    Broughton 32" 6 flute 3/8" flutes
    DE custom 5 port slab brake
    HS Precision PSS stock modified to take the BAT action
    Remington bottom metal (this leaves a nice little space for a few things like a drop chart)
    Jewell trigger
    DE cheekpiece
    BAT 40 moa tapered base
    NF rings light weight
    NF NXS 5.5-22x 50mm NPR1
    ACI mounted to scope tube
    scope level lo pro
    Harris "s" bipod w/ pod loc
    Chambered in 338 Allen Mag. w Kirby spec reamer

    Fired fromed brass today with customer, loaded a preasure series and shot indoors with IR chronograph. Settled on 145 grains of H50BMG, CCI 250's, 300 gr. SMK @ 4.140" OAL. Chrono readings indoor went 3336 fps. Preasure signs were slight, but very reasonable. We loaded up a dozen rounds to go put on paper and drove to the range. We set up in 28 degree, 20%, 2200', 27.6 conditions. I zeroed at 100 yards dead on. My customer shot a 3 shot group just over 1/4". We turned to the 1100 yard plate to see what the drop looked like. I have noted before that my indoor IR chrono readings seem to be a little slow. The exbal program however is pretty close concerning velocity and the flight of the 300 gr SMK. Our dope @ 1100 yards from a 100 yard zero was 18.50 moa!!! Running these figures through the trajectory validation program gives a velocity of almost exactly 3400 fps. More testing of course will confirm this but a sub 16 lb, 1/4 moa, 8000 fl/lb rifle will be tough to beat in Idaho. The 5 port slab break worked wonderfully, both Jr and I were of the opinion that if you could not see what you were shooting you couldn't tell the recoil from my personel 338 Edge we had there with one of my 1" breaks on it. It was very pleasant to shoot. I must commend Kirby's cartridge design, fairly easy to work with and most importantly it will be the ultimate packable "smokin fur" rifle. I will post pictures as soon as I have the finish work all done and shoot some serious test groups. /ubbthreads/images/graemlins/laugh.gif /ubbthreads/images/graemlins/laugh.gif /ubbthreads/images/graemlins/laugh.gif
     
  2. royinidaho

    royinidaho Writers Guild

    Messages:
    8,853
    Joined:
    Jan 20, 2004
    Geez, I just hate to hear things like that. /ubbthreads/images/graemlins/crazy.gif Now I'm gonna have to get off of the couch and go make some fun money. /ubbthreads/images/graemlins/frown.gif

    I showed your post to my 338 RUM and it just drooped its barrel in shame. /ubbthreads/images/graemlins/frown.gif I think it needs counseling but I'll save those kinds of $ for something a bit bigger.
     

  3. jmden

    jmden Well-Known Member

    Messages:
    2,725
    Joined:
    Nov 2, 2003
    Holy...! That's some impressive numbers. I'll be looking forward to hearing more about that.
     
  4. Black Diamond 408

    Black Diamond 408 Well-Known Member

    Messages:
    810
    Joined:
    Sep 6, 2003
    Shawn,
    Does the 8.5 BAT action eject loaded ammo or just the empties? I have been using a 10" and 11" for my customs, but they eject loaded rounds plus are magazine capable.

    I have built 3 this year under the 16# rule. I am currently working on one that should be around 11# when finished, basic rifle weight, no scope.

    Dave
     
  5. Fiftydriver

    Fiftydriver <strong>Official LRH Sponsor</strong>

    Messages:
    6,848
    Joined:
    Jun 12, 2004
    Shawn,

    Very good my friend, its pretty clear there is a serious power shift jumping up to this class of 338 magnum. Load of fun ain't it!!!

    By the way, has Travis heard about this little rifle yet??? /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/grin.gif

    I suspect a rifle order for you after he shoots something like that the first time!!

    Anyway, great rifle as expected.

    Keep us posted.

    Kirby Allen(50)
     
  6. steelhead

    steelhead Well-Known Member

    Messages:
    161
    Joined:
    Mar 15, 2006
    Sounds like another great rifle! I look forward to seeing the pictures and more performance tests.
     
  7. steelhead

    steelhead Well-Known Member

    Messages:
    161
    Joined:
    Mar 15, 2006
    I'm sorry that I have to ask this here, but what exactly is a 338 AM? I've looked everywhere else and would like to know what cartridge is it based off of?

    Thanks

    Devin
     
  8. remingtonman_25_06

    remingtonman_25_06 Well-Known Member

    Messages:
    2,030
    Joined:
    Jun 4, 2003
    Pretty sure its based off the 408 Chey Tac.
     
  9. MTM

    MTM Active Member

    Messages:
    44
    Joined:
    Oct 5, 2004
    ANY ONE WANT TO BUY A UNDER POWERED 338 EDGE. JUST KIDDING LOL /ubbthreads/images/graemlins/wink.gif /ubbthreads/images/graemlins/wink.gif
    GREAT JOB SHAWN WOULD LIKE TO SEE IT WHEN FINSHED
     
  10. Shawn Carlock

    Shawn Carlock Sponsor

    Messages:
    1,897
    Joined:
    Jun 11, 2007
    BD408

    You can make a couple of small cuts and get it to eject those long rounds by hitting the bolt release and going back an extra .5". It is not a pain or anything after mods ejecting a loaded round is very simple but will not just eject by simply pulling the bolt back. Your not getting those 10" actions under 16 are you?
     
  11. Shawn Carlock

    Shawn Carlock Sponsor

    Messages:
    1,897
    Joined:
    Jun 11, 2007
    Kirby,

    Travis is foaming of course.
     
  12. Shawn Carlock

    Shawn Carlock Sponsor

    Messages:
    1,897
    Joined:
    Jun 11, 2007
    The 338 Allen Mag was designed by Kirby and is based on the 408 Cheytac case necked down to .338 and blown out to his specs. Kirby has allowed be to use his design and reamer specs along with initial testing info this was a big benefit for me and I am very greatfull. The design is a whole different planet of power compared to the 338 Edge.
     
  13. DontKickDontKill

    DontKickDontKill Active Member

    Messages:
    40
    Joined:
    Dec 20, 2003
    Wow a .338 Edge, and a .338 Allen mag sound like a combo of rifles I just might have to own some day......
     
  14. Black Diamond 408

    Black Diamond 408 Well-Known Member

    Messages:
    810
    Joined:
    Sep 6, 2003
    Shawn,
    Yes i can get under 16 easy with the 10" or 11" actions. My personal rifle is 16 all tricked out and its my 11" full bolt action. 1.600 dia. stainless.

    Dave