Barrel vibration/harmonics

M

Meph

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So I'll be getting a heavy, long barrel on my .300 Win Mag later this summer and I have read

varmintal.com/atune.htm

this page and found it quite interesting. It got me thinking, should I try to attach or make a barrel tuner device to have my bullets exit the muzzle at a more consistent point? I'm thinking of doing a load development until I find my best load, then make a tuner and increase the weight by a small amount until I get the best accuracy. Of course, I'll have to weight the rear to keep it balanced, but that's not too troublesome.
 
How heavy will the barrel be?

While there are those that "swear" by this, there are also many that put this into the realm of voodoo science.

I would personally save the precious barrel life (particularly with a 300 WM) for conventional load development and just enjoy the results you'll get from a good custom barrel.
 
If you take a corral full of cows that all run different speeds and try a bit, you can chase them all out the same gate. 'Course, the gates not very far away and cows can be tricked.
Let the same cows run for 1000 yards at their different speeds, and they spread out all over the place.
Barrel tuning might get you out of the gate, after that you gotta work on your cow consistancy.
 
Haha. Duct tape.

I suppose what he is eluding to is having the bullet emerge from the barrel at a nodal point. While this make excellent sense, any change what so ever will shift the resonant frequency and thereby the wave length. It really does make good sense...

Many years of fiddling with guitars has taught me, there's only so much you can do, eventually the other guy who just played a crap load starts to sound better than the guy who tinkers on the workbench. Real world practice always amounts to more, and better results. At least it does with music. I'm relatively new to shooting, yet I'm finding similarities.
 
Don't waste your time.
The 300Win will shoot better than you can.
Develop a load and go shoot.
 
X-fan said:
Don't waste your time.
The 300Win will shoot better than you can.
Develop a load and go shoot.
Click to expand...

I agree.
A well put together 300 Win is easily capable of sub 1/2 moa. Even in a very mild recoiling 300 they are not going to group like a 6BR will but incredibly good accuracy is possible, the down side is recoil generated is harder to manage.
 
This concept gets alot of air time over at benchrestcentral.com

Those that use it, really like it. Rimfire BR is where you will see this most often as handloading is not an option.

Some in SR BR use it too. Not sure how many in LR BR do?

With proper load tuning, you will reach the accuracy potential of your barrel and bullet. Having a way to adjust for slight ambient condition changes would be a very interesting experiment and if I had more time, worth a try.

The concept has alot of merit. Just not sure how it will play out in the real world.

If you decide on the process, I don't think you need that much weight. I hear a few ounces are typically used???? BUT the machining for the threads and being able to adjust/lock in place has to be very well done. Any errant movement will do more harm then good.

The Browning BOSS is the only commercial attempt at this concept. The ads showed it did some good. I have never used it myself. No longer offered so maybe the consumer didn't find it that big a deal?????

If you do try it, please let us know how it worked for you.

I can see where it could have some merit in F class.

Jerry
 
Thanks for the posts guys, I know that I'll be outshot by my rifle for a while. This was mainly curiosity.

Is the barrel life of a 300 WM that big of a concern? I thought it was relatively long, compared to other calibers.

mysticplayer said:
This concept gets alot of air time over at benchrestcentral.com

Those that use it, really like it. Rimfire BR is where you will see this most often as handloading is not an option.

Some in SR BR use it too. Not sure how many in LR BR do?

With proper load tuning, you will reach the accuracy potential of your barrel and bullet. Having a way to adjust for slight ambient condition changes would be a very interesting experiment and if I had more time, worth a try.

The concept has alot of merit. Just not sure how it will play out in the real world.

If you decide on the process, I don't think you need that much weight. I hear a few ounces are typically used???? BUT the machining for the threads and being able to adjust/lock in place has to be very well done. Any errant movement will do more harm then good.

The Browning BOSS is the only commercial attempt at this concept. The ads showed it did some good. I have never used it myself. No longer offered so maybe the consumer didn't find it that big a deal?????

If you do try it, please let us know how it worked for you.

I can see where it could have some merit in F class.

Jerry
Click to expand...


I've talked to my friends about the BOSS, and the general consensus is that it worked very well if you followed the instructions and went through the tuning process with your factory ammo (what it was designed to do, give factory ammo the accuracy of very good reloaded ammo) but barely anyone bothered to do that and they dropped regardless of the actual success that the system could deliver.

Thanks, I actually wanted work done by you, but I'm waiting for more money to come in before bothering you. Can you time and true Savage actions? On your website you mention timing, but I don't see much about truing. When I've saved up in a month or so I'll be wanting a Shilen match grade, probably go full 30", bull barrel, no taper. Can you get stocks or do I have to send it to you from inletting/bedding?
 
Barrel life is a relative thing and some may find 1000 to 1200rds of accurate fire tons of life. Others will consider this unacceptable demanding barrel life in the multiple thousands.

The 300WM is going to start loosing its bughole accuracy after 800 to 1000rds. Beyond that, it is up to the shooters as to where accuracy is no longer suitable. At some point, the rifling is bye bye and shotgun comes to mind :)

Given the practise of adjusting loads depending on ambient conditions in SR BR, there must be some small but tangible changes that weather has on your pet load. In F class, we don't reload on site so we shoot what we brought - one best load for whatever mother nature throws at us.

If a tuner could account for any changes that your load is affected by, that would be a very powerful technique. Still it looks like alot to R&D. Could be very interesting.

The bolt timing makes bolt operation alot easier and smoother. Factory is not exactly the nicest pull you can have.

I have built a number of rifles over the last 5 yrs on over a dozen actions with shouldered and barrel nut headspace. Not one was 'trued' and they have all worked just fine. Good QC at the factory and the floating bolt head seems to keep lock up true and tight.

Sorry, I can't offer any target stocks right now, none of the US manf of interest are set up for export. You may have more luck then I.

With the quality of inletted stocks, I see no point in doing that work manually so only bed fully inletted stocks. I can install pillars and do the bedding. This is where I feel finese gives tangible results.

I look forward to discussing you barrel needs and helping you put a rifle together.

Send me a PM or email....

Thanks,

Jerry
 
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