Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

vibration node Q

 
LinkBack Thread Tools Display Modes
  #8  
Old 01-21-2004, 08:46 PM
Silver Member
 
Join Date: Aug 2003
Location: McKinney TX
Posts: 403
Re: vibration node Q

Mikecr,

This is a good subject. I think Jim Ristow understands this particular subject better than most folks. I think Brent will agree. I'm going to copy your orginal post to Jim and see what he thinks. We I get an answer, I'll post it.
__________________
Jeff

Mathew 5:16

Distance is not an issue, but the wind will make it interesting!
Reply With Quote
  #9  
Old 01-22-2004, 04:29 AM
Platinum Member
 
Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: vibration node Q

I agree. [img]images/icons/smile.gif[/img] Mike and Jim might enjoy conversing too. 888-634-8028 [img]images/icons/wink.gif[/img]
__________________
Brent Moffitt
Reply With Quote
  #10  
Old 01-22-2004, 11:11 AM
Silver Member
 
Join Date: Aug 2003
Location: McKinney TX
Posts: 403
Re: vibration node Q

Mikecr,

Here's Jim Ristows response

1) The barrel moves in what I can only describe as a 3 dimensional wave. The amplitude is of course affected by profile, thickness and length.


2) It is caused by the mass of the bullet being accelerated into a twist. The rate of acceleration and twist determines the frequency.


3) Imagine a smooth bore with all rifle mass in line so there is no muzzle rise. There would be no harmonics just slight "ringing". Two entirely different issues.


4) Shorter and thicker barrels are more rigid with less muzzle movement but it is still there. In practical application the nodes (where it will shoot) are simply wider. A "Whippy" barrel is less tolerant of ES and nodes are narrower.


5) Where the barrel shoots best the muzzle is at the extremity of swing, not at the static location....this is the nugget of info that should bring it all together. You can prove this yourself by loading a long thin barrel to several nodes and shooting at the same 100 yard aim point (utra lights are perfect for this). Often lower velocity nodes will shoot up and to the side. I have seen 9 or 10 inches between groups (most only 4 to 5) which proves at least 4 or 5 minutes of muzzle swing on thinner barrels.

[img]images/icons/smile.gif[/img] Hope this helped
__________________
Jeff

Mathew 5:16

Distance is not an issue, but the wind will make it interesting!
Reply With Quote
  #11  
Old 01-22-2004, 07:53 PM
MAX MAX is offline
Silver Member
 
Join Date: Sep 2001
Posts: 263
Re: vibration node Q

Mikecr, you may be a poor country boy but you ain't no dummy. [img]images/icons/wink.gif[/img]

Harold Vaughn's book, "Rifle Accuracy Facts", covers a number of vibration issues and modes, and may be of some help. If not specifically, perhaps in general.

The discussion above is interesting in regards to the weapons, but don't forget about bullet imbalance. It adds to the chaos. Robert McCoy had a few things to say about that.
Reply With Quote
  #12  
Old 01-22-2004, 08:08 PM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,171
Re: vibration node Q

I'm emailing Jim to see if he can expand on this for me. If his methods are sound, then it could be a real break for me.
Else it's back to the grind!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: vibration node Q
Thread Thread Starter Forum Replies Last Post
So now that you have explained the importance of NODE, WHY DON'T MORE OF YOU......... shortpants General Discussion 18 06-24-2014 06:58 PM
no node djtjr Reloading 6 09-14-2011 08:04 PM
Node...please explain shortpants General Discussion 17 04-09-2011 09:31 PM
Limb saver barrel Anit-vibration calhunter805 Reloading 2 03-16-2010 08:52 AM
vibration node Q Mikecr Rifles, Bullets, Barrels and Ballistics 6 01-28-2004 12:41 AM

Current Poll
Spot & Stalk or Ambush For Western Deer?
MOSTLY - Spot & Stalk - 73.62%
1,010 Vote
MOSTLY - Ambush - 26.38%
362 Votes
Total Votes: 1,372
You may not vote on this poll.

All times are GMT -5. The time now is 07:33 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC