How the hell is a piece of rubber going to effect the impact point of a bullet that has already left the barrel before it could possibly have any efect on the vibration of the barrel?Sorry Im not buying this piece of limbsaver tech.

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.

the barrel does not even begin to settle until after the bullet is long gone.......

It's your money. Spend it anyway you wish. Heat, rubber and metal. Sounds like a good combination for a rust problem. Then you have a big wart and corrosion on the barrel.
I choose to work up accurate loads.

I have heard a lot of positive things about these. I don't understand it but I guess it is supposed to alter the harmonics of the barrel and better accuracy is the end result. I don't think it would work for every rifle (heavy barrels, etc.) but it is a cheap way to check it out. I also work up loads for accuracy but this could be an easy way for non-reloaders to get a little more out of their rifles without much investment. Even with reloading, we are never satisfied with our accuracy. We always try to get "just a bit more" out of it even if is shooting 1/4" groups at 400 yds.

Here is a link to it to thoses who are interested:
http://www.limbsaver.com/limbsaver/firearms/barrelderes.aspx

Thanks for a good report, 147 Grain. I suggest extending your testing a little bit further. I would shoot 10, 3 shot groups w/o the attachment, then 10, 3 shot groups w/ the attachment; alternating in between w/ and w/o, from 3 shot to 3 shot group.

Personally I would not be entirely suprised that it works really well on a few guns, a little on some, and not at all on others.

I agree that the De-Resonator will probably not work on all rifles, but in this case, shooting an autoloader (that's less acurate than bolt action) with extra moving parts, the device worked as advertised.

Plan on trying it out on a Remington 700 SPS Stainless 30-06 in the near future; perhaps it may or may not work as well.

5/8" groups from a 30-06 semi-auto using factory ammo had the whole range standing in amazement, as was I. Target is hanging on the wall at the range.

The Limbsaver products work well. I use their recoil pads and my bows have their product to help reduce the noise caused by vibration in the limbs, riser and string.
They do absorb vibration. Besides helping with resonation. They may make a rifle more comfortable to shoot. There is a definite difference in the bow.

I agree!

Especially with their Limbsaver Recoil Pad, which is on all my rifles and shotguns (even the 30-30), and IMHO, is the best on the market.