Home page for James B. Higley, Professor of Mechanical Engineering Technology, Purdue University Calumet, Hammond, IN, higley@calumet.purdue.edu

I have always been interested in arms making technology and try to work in that area whenever possible. The following items are posted in the general interest of recording and advancing this technology. Please see technical articles from James Boatright as well.

Hammer Forging Barrels

Mr. Werner Augustin has considerable experience hammer forging rifle barrels, and he wrote possibly the only technical book on the subject. With his permission, the book is available here in pdf format.

Precision Shooting Magazine is the only magazine dedicated to improving the accuracy of firearms by honestly reporting any technology, issue, experiment, etc. related to these areas. My partners and I have been fortunate enough to have a few articles published as shown below. We'll add more as they become available.

"Hammer Forged Barrels" by Vern Briggs and James Higley was published in the November, 2005 issue of Precision Shooting. The article provides background information on the process and then looks at how Sturm, Ruger & Company manufactures barrels using this process.

The layout of this issue is courtesy of PortONE, http://www.PortONE.com 

"Experiments with Rimfire Hammer Forged Barrels" by James Higley, George Griffith, and Vern Briggs was published in the March, 2006 issue of Precision Shooting. The article discusses the test we ran using Ruger hammer forged barrels on .22 rimfire target rifles.

This article is in pdf format.
"Notes on Hammer Forged Barrels" by James Higley and Vern Briggs was published in the January, 2007 issue of Precision Shooting. The article discusses a number of topics related to hammer forging including some history of the process. This article is in pdf format.
"Experiments with Hammer Forged Barrels on AR-15s" by James Higley and Vern Briggs was published in the July, 2007 issue of Precision Shooting. The article discusses fitting and testing hammer forged barrels chambered in .223 to an AR-15.

This article is in pdf format.
"Experiments with Hammer Forged Barrels on AR-15s, Part II" by James Higley, Brian Vuksanovich, and Vern Briggs was published in the May, 2009 issue of Precision Shooting. The article continues from Part I including tests on a space gun and a DMR. This article is in pdf format.
"The 77/22 as a Training Rifle" by James Higley and Mark Gurney was published in the January, 2011 issue of Precision Shooting. The describes converting the 77/22 into a target rifle including accuracy enhancments. This article is in pdf format.
     

Technical Articles by James A. Boatright

"Yielding of Brass Case Walls in the Chamber, A Technical Note" by James Boatright. This previously unpublished article examines the brass cartridge case as it expands and seals during firing. Theoretical results are compared against Finite Element Analysis (FEA) models to check the procedure.

This article is in pdf format.

"Proper Barrel Tightening Torque" by James A. Boatright was published in the April, 2009 issue of Precision Shooting. The article examines proper barrel tightening torque for accurate rifles. The findings here provide a different approach than in Harold Vaughn's work in Rifle Accuracy Facts.

This article is in pdf format.

Bullet Seating Force spreadsheet. This Xcel spreadsheet lets you calculate the theoretical force required to seat a bullet by specifying the the bullet diameter, case neck wall thickness, and seating depth.

This is an Excel spreadsheet. Click the link to the left and then select Save. Save it to your computer and then open it in Excel.