Go through this website and tell us what you think.

http://www.bp-tec.com/index.html

Demo videos: http://www.bp-tec.com/view_clips.htm

really seems to take the whip out of the 376 steyr.
Are you convinced that there is no increase in sound as claimed?

Woodjack, I've got three of them on rifles. As a brake, they work as well as anything else I have shot, and as a compensator, they are great. They can be tuned to push the muzzle down, hold it absolutely level with no rise or dip, or any where in between. the gun comes straight back, and on calibers like 458 Lott or 416 Rum.

You can see the bullet impact down range.

The stock doesn't raise up and smack you in the chops. With out it all you see is the sky when you touch off a round.

Shot a pig with the 416 RUM, and I could see the impact, and blow through and the 400 grain A-Frame skipping across the grave flats for hundreds of yards beyond, having been launched at 2600 FPS.

Best of all, it puts the gas straight up through the four vents on top, one port for each expansion chamber. This also sends a great portion of the sound waves skyward, and less out the front behind the bullet.

I let a friend shoot it, while I stood a couple of car lengths off to the side, and I'll swear it was condiderably quieter than the 223 he had been sighting in.

The only brake I have seen that took most of the sting out of a hard kicker is that one that looks like the one on the tank guns and heavy artillery, a JP or something like that.
but the side blast was wicked.

woodjack, I might add that I think that with any brake all the sound is still there. Like a muffler, or silencer, all you can do is release the sound waves in increments, and spread out their release over a longer period of time.

The chambers in the BP-TEC, like the expansion tank or chamber on a steam or hot-water heating system taking the hammer out of the pipes, allows the expanding gas to accumulate inside, and then release sequentially, slower and with less force.

I am just guessing that that is what is happening, based on my Machinist Mate training at Great Lakes Naval Training Center, about a hundred years ago.

Walex,
thanks for your responce. as far as side blast goes with the JP design that you mention, would not really be much different to the Up blast of the BP-Tec would it?(if hunting on your own). And if the design worked better I dont see a problem.
cheers.

quote:

Originally posted by walex:
woodjack, I might add that I think that with any brake all the sound is still there. Like a muffler, or silencer, all you can do is release the sound waves in increments, and spread out their release over a longer period of time.

The chambers in the BP-TEC, like the expansion tank or chamber on a steam or hot-water heating system taking the hammer out of the pipes, allows the expanding gas to accumulate inside, and then release sequentially, slower and with less force.

I am just guessing that that is what is happening, based on my Machinist Mate training at Great Lakes Naval Training Center, about a hundred years ago.

July - August of 1977 for me.

ex MM-1(SS)

Woodjack,

Yes, it is different. the JP is desighed so that a good deal of the gas blast is reflected back at you. I think that is also why it decreases the recoil so well, and it does do that beetter than anything else I have seen or fired a round through.

Kind of like the reverse shield on a jet boat, I think. Deflecting the water jet back (or in this case, the gas) must off set the rearward kick of the gun.

I knew a physics professor once who could explain all this stuff, action and reaction. I can visualize it in my mind, but hey, I flunked alegbra twice, so the equations are out of my sphere of competence.

If I could get and use absolutely foolproof hearing protecton , I would put the JP on everything I got.

Wayne