I would really like to know why it does not work with .338 and .375, physics are the same.
Tom as happens with certain things, you as a machinist have not had less than perfect circumstances, have you ever started a piece and felt the vibration?? And if you just put your hand on the work, being machined, felt it calm down?? Now this does mean something is wrong, and you probably stopped and adjusted the tension on the vise, or the angle of the cut, in our less than perfect world, sometimes we put our hand on it, and complete the cut. I am an amateur machinist, but have learned a lot, I have been cutting brake discs for 30 years and dampening bands have always been a part of the process,. But I will defer to a master machinist every time. It seems that you have not used this particular technique though??
Haz, I answered the question with a lot of detail, why do you doubt me?
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They have one for those calibers. What I meant was that one unit works for all but those and the other unit works for them. It also has different threads so they can't be confused.
Re: Barrel Harmonics Question RE: Accuracy & Accessories.
« Reply #10 on: Yesterday at 11:52:15 AM »
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Everything in nature has its own 'frequency'. This frequency can be tuned, in rifles, by systems such ad the BOSS system and others. Some work by lengthening or shortening the barrel in small increments.
Peg, How do you lengthen the barrrel?
The barrel itself is not lengthened as to the rifling itself, just the overall rifle length to a minute extent. Pardon me on that one, I was in a hurry... and trying to get on screen what was in my head (that's why I'd never be a teacher because it don't always come out how I mean). The unit itself is 2" long and has about 3/4" of in/out adjustment. If you screw it out to make a larger chamber, it does in effect lengthen the overall length a little....but that's not what I was trying to say....I just muddled it up.
Now, what it does, according to Browning, and also as M25 explained in an earlier post, is vary the pressure of the escaping gasses (like an expansion chamber) in order to hopefully create equal pressure all the way around the bullet as it exits the rifling. Any minute pressure imbalance as the bullet exits will cause deviation. That's also the reason for some recessed target barrels, as they square the rifling to the barrel to optimize exit pressure around the bullet as it leaves the barrel. That's why you get that almost perfect star pattern on the end of a target muzzle from powder and gasses.
And for those who wonder, the BOSS works. At least mine does. My A-Bolt .308 will shoot just as accurately out to 600 yds with 168gr bullets as my friends Remington 700 Heavy varmint rifle. It just heats up quicker after a string of shots, as with any light barrel, and then all bets are off for tight MOA work. That's why it's a hunting rifle and not a bench rifle.
Dave Petzal wrote a good article on sub-MOA accuracy in the July 2008 issue of Field & Stream, but I can't find it online.
The gist of the article was that for a rifle to be accurate, it needs to be as solid as possible at the receiver, the barrel needs to be exactly true to the receiver, the bore axis needs to be square to the barrel, and thus to the receiver, the muzzle needs to be also square, and everything needs to be tight and rigid.....think benchrest rifle.
If anyone finds the article, please post.
Hope that clears up my mis-leadings.
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