Yes it does ... but only YOUR gun on YOUR rest, with YOUR technique and loads can tell us ... or you for that matter ...

Some folks will tap the action/barrel with a hard plastic-faced hammer to vibrate the barrel.  Many methods work.

Quote:

Yes, the general Rule of Thumb is the Null Point for harmonic vibration of barrels is approximately 7" from the muzzle.  This is not an Absolute because the Null Point is dependent on the reload (fps & bullet weight) - but it is a good starting point

To find the Null Point - remove the forearm.  Hold the rifle vertical by the stock.  With a brass hammer, tap the barrel towards the muzzle.  You'll hear ringing from the taps and when you hear a 'thud' ... that's the Null Point of the barrel not taking into consideration the effect of the reload

I've put a rubber O ring under the stock bolt and for these riflles, the Null Point is the riflle resting on the back part of the forearm

I'd have a hard time hearing any ringing from the taps as I hear ringing all the time anyway.(Tinnitus)

Hmmmm.  I've GOT to dig out the frequency meter to determine the orders of vibration!

WOW.   
I did dig out (albeit cheap and not calibrated) a spectrum analyzer.  (an app for Android devices)

Just taking a small brass hammer (ok I should use something more dead acoustically like leather or lead) and tapped gently 8 or 10 different rifle barrels.

Each had it's own 'signature' of resonances.  That signature changed as I moved the point of tapping from muzzle to breech.

With almost every rifle there was a 'dead' spot 5 to 8 inches back from the muzzle.  (Volume was less than on either side and the higher frequencies were attenuated.)

One or two barrels would ring.  That ringing was generally low in frequency (about 200 Hz on one).

The higher frequencies observed were from 2k to 5kHz.

Some barrels would have a wide band of resonances (about 2k or 3kHz wide) which would move up or down the scale as the tapping point was moved.

Most all the responses were higher in frequency as the point of tapping moved nearer the muzzle.

ONE rifle had two clear peaks of resonance (in the higher frequencies) - it also had a two piece stock.

Lots more that can be done; like attaching a bobsled and repeating the tests.

Unanswered:  does any of this have any affect on accuracy?

Lead Pot wrote on Dec 18^th, 2014 at 12:04am:


Interesting point.

That is the assumption that I make.  I would further assume that the 'hardness' of the 'connection' would have an effect - more or less bounce - or some level of damping of vibration.  Makes sense that the cross sticks generally sling the barrel in leather.