6,5mm Japanese Arisaka Ammuntion Dimensional Revelations (Photo Heavy)

[jmoore]

Some details and photos of the cases after firing- see the link: Japanese Ammuntion and Rifle Testing for the range report (posts #1 and 2). This post will then make more sense!


#21a


#21b Yup, two pierced primers- that and the misfire halted further testing of this ancient ammunition!

The Milsurp rounds above- note the odd crimp on the misfired example- Some more were found mixed in on other chargers pulled from boxes w/loose lids. Repackaged?


#21c The raised crimp made bolt turndown an exercise. Note the shiney areas polished and "mashed" more flush during bolt closure.The angled locking faces found on many Type 38s were of great assistance here!


#21d Primer back-out w/ the use of o-rings was reduced to 0.000" to 0.003" on the Series 27 rifle whilst using Hornady ammo. Most were flush.


#21e The Type 97 had a little more primer back-out, but not much more. Few altogether flush.


#21f


#21g The Norma (packaged as Federal/American Eagle) primers backed out anywhere from 0.000" to 0.007". Still, the o-rings were an improvement over previous sessions.


#21h Cases bulged, both milsurp and commercial, but no signs of case head separation were seen.