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

[jmoore]

16 May 2011 ETA: see also the thread link below as it will tie into this one:

Japanese Ammuntion and Rifle Testing


As part of an investigation instigated by a thread on the Japanese Rifles forum, I decided to actually check some dimensions of some milsurp and some commercial ammuntion.

Three highlights and then mostly pictures.

First: Original bullets (four different samle types) AREN'T 0.264" diameter. More like 0.2615-0.262".

Second: Some commercial ammo is seriously undersized on the rim thickness and drop to a shoulder datum. (pick whatever datum you want- its still short!)

Third: Base dimensions for all ammo checked are fairly uniform but small for the chamber. (This is what started this knowledge quest originally!)

Blue million pics!:




1a, 1b. Milsurp ammo


1c.


1d.


1e.


1f.


1g.


1h.

That'll do to start. More coming...

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