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Extreme Long Range Hunting & Shooting (ELR) Over 1,000 Yds.

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What is going on with ELR Forum.

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  #8  
Unread 03-11-2013, 04:49 PM
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Re: What is going on with ELR Forum.

Quote:
Originally Posted by Broz View Post
My LRKM will be Shawn's design of a 338 LMAI and will be know as the .338 Terminator +P. I had to arm wrestle him to get him to do it. He won the wrestling match but felt so sorry for me afterwards he agreed to do some and add the +P.

So mine will be the first of this chambering and all we have is speculation at this point.

Jeff
OK. That's what I thought I remembered. The anticipation must be killin' you! Any delivery time period?
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  •   #9  
    Unread 03-12-2013, 09:11 AM
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    Re: What is going on with ELR Forum.

    Quote:
    Originally Posted by jmden View Post
    OK. That's what I thought I remembered. The anticipation must be killin' you! Any delivery time period?
    Yes I am anxious, but I talked to Shawn yesterday and didn't ask. I figure he wants it done as much as I do and will let me know when. I trust my smith.

    Jeff
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      #10  
    Unread 03-12-2013, 06:00 PM
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    Re: What is going on with ELR Forum.

    I would bet you will be very happy with Shawns +P throat design in the 338 Lapua Improved.

    In my 338 Allen Xpress which is similiar, I was able to break 3000 fps and so so with an OAL of 3.650" and in a 26" barrel length. That was with my Hybrid throat design which is similiar in design to Shawns.

    I would think you will go well north of 3K with comfortable pressures.
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    Kirby Allen(50)

    Allen Precision Shooting
    Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

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      #11  
    Unread 03-12-2013, 06:04 PM
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    Re: What is going on with ELR Forum.

    Quote:
    Originally Posted by Fiftydriver View Post
    I would bet you will be very happy with Shawns +P throat design in the 338 Lapua Improved.

    In my 338 Allen Xpress which is similiar, I was able to break 3000 fps and so so with an OAL of 3.650" and in a 26" barrel length. That was with my Hybrid throat design which is similiar in design to Shawns.

    I would think you will go well north of 3K with comfortable pressures.
    Thanks for the words of encouragement Kirby. My barrel will be a 32" so I hope to be impressed at the chronograph.

    Jeff
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      #12  
    Unread 03-12-2013, 06:24 PM
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    Re: What is going on with ELR Forum.

    These special throat designs really change the pressure characteristics of a specific chambering. I can only speak for my experiments but in most cases, it takes a couple grains more powder to reach standard velocities but they also allow for even more powder to be used to take velocity significantly over standard velocity ranges.

    Some chamberings also seemed to benefit from stepping down to a slightly faster burn rate of powder.

    The flattening of the pressure spike is truely impressive and the ability to give the advantage of freebore with the accuracy benefits of a short throated chamber is really the best of both worlds.

    One word of caution, keep the barrel cool. In my testing, these throats, depending on barrel, can be a bit sensitive to getting the barrels hot and keep them shooting. Some of my test barrels have had very limited barrel life as I was not overly kind to them doing ballistic and load development. Others have lasted nearly as long as standard throat barrels, those being barrels that I limited to three shot strings and allowed to cool between.

    Have fun!!!
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    Kirby Allen(50)

    Allen Precision Shooting
    Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

    Farther, Faster and Flatter then ever before.

    Web Page: www.apsrifles.com

    allenmagnum@gmail.com
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      #13  
    Unread 03-12-2013, 08:12 PM
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    Re: What is going on with ELR Forum.

    Are you using your old 338 LM as a donor for this build or is it all new? Dave Garrett
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      #14  
    Unread 03-12-2013, 10:27 PM
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    Re: What is going on with ELR Forum.

    Quote:
    Originally Posted by dgarrett View Post
    Are you using your old 338 LM as a donor for this build or is it all new? Dave Garrett
    DGarret, I sold my 338 LM turn key and I am starting over with a new build on the LRKM chassis.



    Kirby, I am a 3 shot group guy and usually only 2 shots checking drops. Thanks for the advice.

    Jeff
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