Recoil reduction on 300 RUM

Discussion in 'Videos Of Tech Stuff And Reviews' started by J E Custom, Nov 11, 2013.

  1. J E Custom

    J E Custom Well-Known Member

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    I had promised this video a couple of weeks ago and here it is.

    After tuning the ports to the max of my calculations, I was very pleased with the outcome.

    The last test was the same rifle as in an earlier test the earlier test was with a slightly tuned
    Assassin and the last was max. while testing we got over 70% on a 30/378 (No Video).

    Enjoy [ame="https://www.youtube.com/watch?v=Y2BM396_6AY"]Recoil reduction of large overbore cartridges. - YouTube[/ame]

    J E CUSTOM
     
  2. MMERSS

    MMERSS Well-Known Member

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    Thanks for taking the time to post the video. Interesting sled.
     

  3. J E Custom

    J E Custom Well-Known Member

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    A good friend built the sled. after we looked at all of the ways this was the most accurate and repeatable method we could come up with.

    We looked at smooth surfaces and they weren't repeatable.

    Next we looked at weights and found that they were not accurate because the rifle had to overcome
    the inertia of the weights before it could move and different recoil values could not be predicted.

    By using the different springs with a spring rate chart for each combination we could calculate the recoil using standard charts and the device would almost exactly duplicate the numbers. In fact
    It reads almost one pound greater than calculated so our numbers are slightly conservative.

    It is also extremely repeatable (Very important for comparing results).

    The device/sled only has a couple of pounds applied in battery, so the rifle is aloud to start moving instantly .

    The name (Recoil Master 3000)started out as a joke but it stuck.

    Each time we started a test we first tested a 30/06 with no brake and the same ammo as always
    to make sure we had consistent results.

    My friend Carl designed and built it, and I give him full credit for a very good test bed.

    J E CUSTOM
     
  4. MMERSS

    MMERSS Well-Known Member

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    Thanks for the information. Nice to see shop projects put to good use.

    Do you have "hurt" indicators on the slide scale? This mark here will hurt a-little, this one more and this one a-lot!:D
     
  5. J E Custom

    J E Custom Well-Known Member

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    I would depend on the shooters tolerance to recoil.

    I find that the 15 ft/lbs of recoil energy is enough for many.

    Then you step up to 20 to 25 ft/lbs for the experienced shooters.

    35+ ft/lbs would be the point that recoil would be acceptable to some.

    Most people draw the line at anything over 50 ft/lbs.

    I my self are in the brain dead group that will tolerate 80 ft/lbs but the fun has gone out of shooting more than 8 or 10 shots.

    There is however one group that will shoot up to 100 ft/lbs and swear that it did not hurt.

    Everyone has a different level but anyone should be able to handle 12 to14 ft/lbs .

    Just my thoughts.

    J E CUSTOM
     
  6. dodgefreak8

    dodgefreak8 Well-Known Member

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    Very Impressive! Is this brake available for purchase? I am currently building a 300rum and I like what I see here! Curious about a price.
     
  7. J E Custom

    J E Custom Well-Known Member

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    Yes . I sent you a PM

    J E CUSTOM
     
  8. dodgefreak8

    dodgefreak8 Well-Known Member

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    I received my brake from Jerry today and it really is a thing of beauty! It is tuned and bored for my 300rum and looks great. Can't wait for my build to be finished so I can try it out!

    Thanks Jerry!
     
  9. HarryN

    HarryN Well-Known Member

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    Does anyone know what software is needed to view the video ? I must be missing it on my laptop.

    Thanks
     
  10. specweldtom

    specweldtom Well-Known Member

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    Harry, I just used the Yahoo search window for YouTube and then plugged in JE Custom and got to his website. Hope it works for you.

    Good luck, Tom
     
  11. HARPERC

    HARPERC Well-Known Member

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    Worth the wait! Thank you.
     
  12. Doublezranch

    Doublezranch Well-Known Member

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    I have 3 tuned Assassin brakes. They are the best on the market for recoil reduction. I have one on a 300 RUM that the felt recoil is that of a 243. They are wonderful.
     
  13. specweldtom

    specweldtom Well-Known Member

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    I just put a tuned Assassin on an 11 lb .338 Lapua. With 225gr Nosler Trophy ammo, calculated recoil is 42.5 ft/lbs.

    With the brake, it's just under 15 ft/lbs.

    Margin of error for all rifles tested on the sled has been + or- 1 ft/lb.

    Tom
     
  14. J E Custom

    J E Custom Well-Known Member

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    Several people have ask what happened to the Video I had poster on this thread. Not sure but I
    will repost it for them and anyone interested in watching it.

    [ame="https://www.youtube.com/watch?v=Y2BM396_6AY"]Recoil reduction of large overbore cartridges. - YouTube[/ame]

    J E CUSTOM