Barrel Vibration & Tuning

Z

zini72

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I have been reading "Extreme Rifle Accuracy" by Mike Ratigan. In chapter 13 pg. 128 he talks about tuning your powder load so the bullet exits the muzzle during the top or bottom of the barrel vibration stroke. He also mentions that more information can be found in Harold Vaughns book "Rifle Accuracy Facts". So I bought & read that book as well.

Q: How do you know where the bullet is exiting the barrel in the vibration stroke?

I apologize in advance if this seems silly.

Thanks, Edward
 
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Edward

Probably when there is no appreciable verticle in the group.

You might want to look at the thread that is running titled "Horizonal tune". I don't know if Mike addresses this in his book, but more shooters are beginning to recognize that there is more to achieving a competitive Benchrest tune than just the up and down of the barrel's vibration patterns........jackie
 
zini72 said:
I have been reading "Extreme Rifle Accuracy" by Mike Ratigan. In chapter 13 pg. 128 he talks about tuning your powder load so the bullet exits the muzzle during the top or bottom of the barrel vibration stroke. He also mentions that more information can be found in Harold Vaughns book "Rifle Accuracy Facts". So I bought & read that book as well.

Q: How do you know where the bullet is exiting the barrel in the vibration stroke?

I apologize in advance if this seems silly.

Thanks, Edward
Click to expand...

Ladder Testing

http://www.benchrest.com/forums/showthread.php?t=56338&highlight=ladder
 
zini72 said:
I have been reading "Extreme Rifle Accuracy" by Mike Ratigan. In chapter 13 pg. 128 he talks about tuning your powder load so the bullet exits the muzzle during the top or bottom of the barrel vibration stroke. He also mentions that more information can be found in Harold Vaughns book "Rifle Accuracy Facts". So I bought & read that book as well.

Q: How do you know where the bullet is exiting the barrel in the vibration stroke?

I apologize in advance if this seems silly.

Thanks, Edward
Click to expand...

zini,

in answer to your question, you do it by carefully observing your shooting results on target.

And no you're not being silly........

I do it by using a straightedge to draw a horizontal line on a large sheet of paper. I shoot my groups and use the horizontal line as a reference, a place from which to measure. Using highly accurate equipment it's easy to see that as velocity rises due to increased powder charge or other, point of impact (poi) DOES NOT necessarily rise at a corresponding rate. In other words, faster bullets DO NOT necessarily print higher on the target as simple logic or a simple model would dictate. By comparing where the bullet SHOULD impact VS where it DOES impact we can 'see' empirically where the barrel is in it's up and down cycle.

"Horizontal Tune" is unrelated to all this, if your load (actually your system) is producing horizontal you've got other problems to address.

opinionsby


al
 
Thanks for the responses. I went back and re-read the chapter on barrel vibration in Vauhns book.
It makes more sense now. How about the article on 6br.com about 1K ladder testing?
Hopefully I will get out this next weekend to test.
Thanks again, Edward
 
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