Rifle Accuracy Facts and Test Data

[411man]

How about some facts and test data on Rifle Barrel accuracy as related to length, vibration, shock wave, etc. effects.

Read the links below.

Rifle Barrel and accuracy facts.
http://www.chuckhawks.com/rifle_barrel.htm


Facts and Myths on Heat Induced barrel mlovement.
http://www.rifle-accuracy.com/barrel-movement.htm


Barrel Vibration Anaslysis.
http://www.varmintal.com/atune.htm


Barrel Shock Wave Theory.
http://www.the-long-family.com/shock...xplanation.pdf


Facts on Barrel length and accuracy.
http://www.tacticaloperations.com/SWATbarrel/



Test results:
http://www.accuratereloading.com/223sb.html


More information on this subject.

Box O' Truth website is one everyone needs to search throughly.

http://www.theboxotruth.com/docs/theboxotruth.htm

http://www.theboxotruth.com/docs/educational.htm

[yarro]

The test from the second from the top link is not indicative of production guns as they used a Lilja benchrest quality barrel, which was never straightened during manufacturing and was fully stress relieved before manufacturing and after rifling. My Ruger M77 in .270 strings up and slightly to the right if you let the barrel heat up, first 3-5 shots are OK. I actually never noticed it until I used it to shoot prarrie dogs after I ran out of .223 for my Savage. A Win M70 varmit that I had strung to the left and slightly down as it heated up, but not enough to worry about unless the prarrie dogs were out beyond 300 yards. Both had the actions bedded and barrel free floated. My Savage with Lijia sporter weight barrel exhibits no change of impact with temperature unless I leave the round chambered awhile and it soaks up heat changing the pressure characteristics of the round. A friend's FN SPR really strings bad if you let it heat up, but the heavy barrel allows quite a few more shots before you see it.

"The heating of a barrel through firing it is often enough to allow some stress movement to occur." from Lilja's website.

"All of the steel used in the manufacture of our barrels is stress relieved by the steel mill as their last operation and again following the rifling operation in a vacuum furnace. " from Lilja's website. This is not done to most production barrels.

"Rifle barrels made using the hammer forge process contain a tremendous amount of stress. This explains why some barrels on mass-produced factory rifles will walk their shots as those barrels heat from firing. " from Lilja's website.

-Yarro

[411man]

Thanks for the points and observation.