Sim's Barrel Deresonator: Range Report

Discussion in 'Hunting, Fishing & Camping' started by 147 Grain, Aug 5, 2005.

  1. 147 Grain

    147 Grain

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    Update:

    Went to the range today to see how my Remington 7400 30-06 autoloader would do with the Sims Barrel De-Resonator and (after loosening the forend stock's screw to just finger tight) achieved the following results:

    August 5, 2005
    12:10pm - No wind, but 94*F.
    Target Distance: 100 meters
    Ammo: Federal Premium Vital Shok 180-gr. Nosler Solid Base
    Results: 4 shots within 5/8" from center to center.

    [​IMG]


    Previously, with no Barrel De-Resonator and the stock's forend screw very tight:

    June 2, 2005
    10:30am - Slight East to West wind, and 81*F.
    Target Distance: 100 meters
    Ammo: Federal Premium Vital Shok 180-gr. Nosler Solid Base
    Results: 4 shots within 1 3/4" from center to center

    [​IMG]


    Seems that these two small adjustments cut the groups in half. The $19.95 Barrel De-Resonator was installed about 7/8" in front of the stock's forend screw, which seems to be the magic spot on this rifle.
     
  2. bustedknee

    bustedknee The Snowflakes have invaded GT

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    How about loosening the stock screw, slide a credit card between the barrel and fore end, then tighten the screw. Move the card fore and aft as required for best accuracy.

    Ruger puts a "bridge" in their fore ends for this very reason, to reduce vibrations. However, it is not tunable. So I sand it out and use an old credit card. After I find the spot, I cut the card to the shape of the fore end.

    Browning had the "Boss", a tunable nut on the muzzle for tuning.
     

  3. 147 Grain

    147 Grain

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    Good Point! Can I borrow your credit card to see if it works? ;)

    My barrel is free floated as much as possible and I'm amazed at how well the Barrel De-Resonator absorbs the vibrations while the bullet is inside the barrel and tones the barrel's movement for increased accuracy. It was designed to dampen out unwanted vibration by shortening the overall settling time of the barrel. Moreover, I believe the accuracy benefit can provide sub-minute angle groups with over-the-counter factory ammunition - given a shooter who's mastered very basic shooting skills.

    Moving the rubber De-Resonator along the barrel alters vibrations in the same manner a reloader would add or subtract a 1/2 grain of power for improved accuracy.

    The principle is the same for reloading, using a rubber Barrel De-Resonator, or BOSS on Browning rifles.
     
  4. 147 Grain

    147 Grain

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    2nd Update:

    Just returned from the range again, and after experimenting with the Limbsaver Barrel De-Resonator on a stable bolt action with less moving parts, observed that the device did not affect accuracy at all.

    Rifle was my son's brand new Remington 700 SPS Stainless in 30-06 that was given for his earning of the Eagle Scout and Duty to God Awards.

    [​IMG]

    Will still use the device on the Remington 30-06 autoloader which I firmly believe makes a difference due to it's multitude of moving parts.

    [​IMG]
     
  5. bustedknee

    bustedknee The Snowflakes have invaded GT

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    It makes sense to me that it would work best on an autoloader.

    I have a BAR that shoots all over the place unless the fore end screw (it holds the sling swivel as well as secures the wood to the barrel) is tightened really tight.

    I'm not familiar at all with the Remington.