Rifle Accuracy Facts - Harold Vaughn

The Internet Archive has a pretty decent full scan available:

https://archive.org/details/RifleAccuracyFactsFullV1.0FirstFullScan

And can be downloaded in text, PDF, etc... (though Kindle format didn't work for me). Enjoy!

 

Thanks for sharing ,I never knew that was available . I just checked it out for a minute ,it even reads it aloud . Perfect for background or serous reading . Amazing what is available on the web .

 

You’ve ruined my principal retirement plan: selling my mint copy. Dang it.

 

I gotta get someone to make me that bullet spinner.

 

I need to brush up on my .270 charts/graphs.

 

thanks. next thing you know someone will publish "gun muzzle blast and flash" klingenberg and heimerl AIAA of which i have a pristine hardback... and saw one for $1300 at an online bookstore... not a full retirement but at least a pretty darn good pdog rig...

 

Like my external ballistics book i need to sell

 

I still have my Harold Vaughn autographed book.

 

Great find Jay!

Just FYI...
If you scroll down on that original link you can find a links to download in various formats for offline viewing

 

There is a wealth of precision shooting info both in, and between the lines in that book! RG

 

Well that consumed an evening. Excellent info in that book.

 

Thank you for this link.

 

With regard to another thread on this forum discussing how much torque to apply when tightening a barrel to the receiver, I found chapter 6, Barrel-Receiver Threaded Joint Motion to be particularly interesting.

In this chapter, the author discusses measuring barrel movement shot to shot and resultant flyers, and how barrel torque and barrel thread design affects the degree of movement.

He found a torque of 200 ft lbs to achieve a preload of 20,000 lbs to be impractical due to barrel wrench failure, and the required preload to be impossible due to thread failure due to the limits of the V-thread design and steel used, as well as the recoil lug steel.

In summation, the barrel to receiver joint moves shot to shot in most every rifle. Heavy barrels help this by moderating the temperature gradient between chamber wall and receiver threads which tend to loosen the grip the receiver has on the barrel, but it does not stop movement.

Part of the reason for this is that only the first few threads of the receiver/barrel joint take most of the load with the rear most threads taking almost nothing.

This reminds of Virgil King's insistence that lapping the threads in on a new barrel installation was necessary to spread the load across the threads better. Seems he was a couple of decades ahead of Vaughn

 

No matter if the threaded joint is 4” long only a few threads are mated. The fitted thread on a barrel has been proven to be not as good as a loose thread too many times

 

I did some internet searches and could not find an answer. Can anyone tell me what disicipline/disiplines did Vaughn compete in?

Later
Dave

 

The book is excellent, but it has to be read with an open mind. Too much of it has proven out in practice to not be "fact". Barrel movement for example, and thread lube. I know of multiple AGG records shot with moly and teflon grease on threads. Barrels are not moving, the groups shot on a regular basis in BR would be impossible with even the slightest movement. The book is a great read and a lot of work went into it, but even some that were involved dont agree with all the conclusions.

 

Is it possible that in the time since he did his research that overall machine technology has improved to such a degree that whatever he fitment issues he was experiencing has been remedied by more consistency in the machining of parts?

He was after all buying and using second hand factory made rifles for his tests that were made decades ago. And we know how much Remington and others have changed over that time frame.