Browning rifles with BOSS system

[warbirdlover]

Could one not achieve the same goal - reduce the harmonic vibration and improve accuracy - by using a barrel de-resonator? You could avoid the increased report caused by the Boss system.

JoeChicago

I played with the LimbSaver de-resonator on my Ruger which was already a sub-MOA rifle. I moved it all over and didn't see any improvement, however I know it works on rifles that don't shoot good groups from talking to others at the range. Looks like heck though. I don't think it's nearly as effective as the BOSS system but a whole lot cheaper.

Schroll down on this link and look at the "AIM" system installed by Gander Mountain gunsmiths....
http://www.gandermountain.com/gunsmith/accurizing.shtml

When I'd run into a wall trying to get better groups out of a rifle with a free floated barrel I'd try putting pressure on the barrel. On some rifles this works!

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[Bart B.]

Browning claims their BOSS adjusts the barrel whip frequency so the bullet leaves when the barrel's stationary. Impossible.

The barrel's never stationary after the primer detonates and burns the powder creating a pressure curve. It wiggles and whips all the time the bullet goes down the barrel and continues for a bit after the bullet's left.

If someone thinks the best place for the bullet to exit is when the muzzle axis is at its highest angle, they need to rethink that. Browning's never proved this happens with their BOSS. Neither has anyone else as far as I know.

'Twas proved over a hundred years ago that the best place for bullets to exit is just before the muzzle angle reaches its highest value as it swings up. Handloading ammo can do this; use the powder charge that gives the smallest many-shot groups at the desired range. With factory ammo, the BOSS may be adjusted to accomplish the same thing, but there's no guarantee.

[barnbwt]

I've been intrigued by the BOSS system since it appears it actually works to improve accuracy, moreso since I own a BAR-based FNAR. Does the device just screw onto a threaded barrel, or is there more to it than that? It's basically a position-adjustable muzzle-break/weight, right? I'm suprised other makers aren't ripping off the concept (patents, I guess...)

TCB

[Keg]

If the gun has a BOSS on it....That is a plus for me....

[natman]

Browning claims their BOSS adjusts the barrel whip frequency so the bullet leaves when the barrel's stationary. Impossible.

The barrel's never stationary after the primer detonates and burns the powder creating a pressure curve. It wiggles and whips all the time the bullet goes down the barrel and continues for a bit after the bullet's left.

You're right, the barrel does "wiggle and whip" from the moment the cartridge fires until well after the bullet is gone.

However, while the barrel is wiggling, there are brief moments when the barrel is indeed stationary, just as the barrel stops wiggling in one direction and before it starts wiggling in the other. That's when you want the bullet to exit and tuning the BOSS allows you to find that sweet spot.

[Bart B.]

Nobody, including Browning, has proved bullets leave at the top or bottom of the muzzle axis swing with the Boss set for best accuracy. One can adjust charge weight 1/10th grain and do the same thing as a quarter turn of the BOSS ring. And no powder charge makes pressure curves exact enough to make all bullets leave at the exact moment the muzzle axis is stationary

It has been proved that best accuracy is when bullets exit just before the muzzle axis reaches its highest angle which more easily and better corrects for velocity spreads.

[natman]

Nobody, including Browning, has proved bullets leave at the top or bottom of the muzzle axis swing with the Boss set for best accuracy. One can adjust charge weight 1/10th grain and do the same thing as a quarter turn of the BOSS ring. And no powder charge makes pressure curves exact enough to make all bullets leave at the exact moment the muzzle axis is stationary

It has been proved that best accuracy is when bullets exit just before the muzzle axis reaches its highest angle which more easily and better corrects for velocity spreads.

I'm not quite sure what point you are trying to make. First you say it's unproven, then you say it's proven. If you want to quibble about whether the best spot is "just before the muzzle axis reaches its highest angle" instead of standing still, please explain why. I'll grant you that while the muzzle is moving slowly just before it stops is easier to find than when it stops, but I don't see how it's better. Perhaps a citation to your proof would explain it.

[Bart B.]

Once one understands the ballistics for a given muzzle velocity in a 40 fps spread and the departure angle each needs for a given bullet to strike the same place on target, it is easy to figure out where in the muzzle axis vertical swing it's best for all the bullets to leave at. It ain't rocket science. Remember that lower muzzle velocities leave later than higher velocities.

[natman]

Once one understands the ballistics for a given muzzle velocity in a 40 fps spread and the departure angle each needs for a given bullet to strike the same place on target, it is easy to figure out where in the muzzle axis vertical swing it's best for all the bullets to leave at. It ain't rocket science.

It ain't any kind of science at all as far as I can tell.

Again, got a citation?

[Bart B.]

Skip the high level math formulas and look at the last page. That's the best part.

http://archive.org/details/philtrans05900167

On the left side, click on PDF in the "View the book" window.

Simple reasoning is that for slower bullets to strike the same place as faster ones, they all have to leave when the muzzle axis is on the upswing. No other part of the arc lets that happen.