Anybody else read this book? Boy he's sure got some interesting info on what forces are acting on different parts of a firearm to affect accuracy. He is the ultimate "Techno weenie". He was an aeornautical ballistician who won many awards for figuring out the ballistic issues of making nuclear missiles fly better!,and an avid benchrest shooter and hunter. Some of the math and formulas information was a little dry reading for a mere mortal but man that guy did some cool experiments to figure out what affects where a bullet goes. Everything from bullet seating depth, throat half angle degrees, uneven tension on the reciever caused by screw tension or number of holes, to barrel vibration! Pretty interesting read. He would be a pretty cool old fella to have for a neighbor!!
BOOK, "Rifle Accuracy Facts" by Harold Vaughn
- Thread starter fatboyz
- Start date
- Location
- Ft. Mac. Alberta
been reading that books for a very long time now, I jump into it whenever i am researching a problem.
it's right up there with Hatcher's notebook, The Accurate rifle, and Mann's smallbore acuracy rifle facts.
Cat
it's right up there with Hatcher's notebook, The Accurate rifle, and Mann's smallbore acuracy rifle facts.
Cat
I've read it and it is excellent. He got me straight in my thinking about the rise and drop effect on POI of a side wind, and how to estimate it. Also the effect of a head and tail wind (essentially zero). That knowledge is not commonly out there.
He identifies some controversial issues. He presents evidence to show one contributor to inaccuracy is that a barrel does not stay tight in the receiver, and it may not be possible to put enough torque on the barrel to keep it tight. Also, he presents a case that moly coated bullets do not reduce friction. He provides some evidence to suggest the moly vapourizes and kills some of the energy of the powder. That is said to be the reason for a velocity drop when switching to moly coated. He convinced me. I avoid the moly bullets now.
He identifies some controversial issues. He presents evidence to show one contributor to inaccuracy is that a barrel does not stay tight in the receiver, and it may not be possible to put enough torque on the barrel to keep it tight. Also, he presents a case that moly coated bullets do not reduce friction. He provides some evidence to suggest the moly vapourizes and kills some of the energy of the powder. That is said to be the reason for a velocity drop when switching to moly coated. He convinced me. I avoid the moly bullets now.
- Location
- Ft. Mac. Alberta
The section on just how inefficient screws for mounting scope bases can be was very informative, for sure!
Cat
Cat
When you look at how he redesigned the barrel/reciever attachment to eliminate the barrel joint motion it makes me wonder if the Savage barrel nut system was trying to fix that problem? Another interesting fact is that for production sporters he found a 20-30% increase in accuracy by putting an upward strain on the barrel at the front of the stock. Esentially instead of free floating it is preloaded upwards with about 10psi of force! Kind of like the remington VTR with the triangle barrel it touches at the front. One gun nutter here said he removed that high spot and his accuracy went to hell.
- Location
- Ft. Mac. Alberta
Upward pressure on a lighter barrel has been used for quite some time now, the Remington 700's and others were made that way for years, but yes, MANY shooters figure that a floated barrel is automaticly more accurate than one with a pressure point!
The good thing about it, is if you find it's no good, you can always put the pressure point back in!
Cat
Not sure if Savage intended to address the issue with the jam nut, but it is an effective way to solve the problem.
Most sporter barrels were loaded until Winchester came along in the late 60's or so and started with the free floating barrel. It works best with heavy barrels, and not as likely with light sporter barrels.
