Japanese Ammuntion and Rifle Testing

[jmoore]

Part the First:

This thread is an extention of another on the Ammunition and Reloading forum (ETA link below):

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

See Post #21 (Et al.?) for specifics on this session.


Expect both to be sort of an on-going work.

As for 13 May 2011, a tiny initial test session to get things started.

Warm up:

M1a 134918 a thoroughly abused and monkeyed with rifle that's back to a surprisingly conventional configuration.

TRW USGI barrel witth several thousand rounds through it that I know about (because I did it).
SAI "plump" stock that has a favorite "feel". -Note: no bedding(!), but good fore end tension and trigger group clamping pressure.
Leupold Ultra M2 10x on an old ARMS 18 and 19 mounting set.
Std GI flash hider (not reamed)
Modded trigger hsg and hammer as posted elsewhere on other old threads.

Not very Japanese so far, but it shot so well after having JUST been thrown back into the wood stock from a JAE unit, that details might useful before I forget them....

No rezero, no warm up sighters, just ten rounds:


Note the fancy bench rest set-up. Operator was wearing two T-shirts (a little cool) and fired LH.


1st five rounds fired after stock swap.




Next five. Note that the zero was previously spot on with this ammo whilst in the JAE stock. Mighty good group for a tired chrome lined bored rifle. But it isn't unusual! I don't deserve it, but...

So with that baseline established, the real test:


Same fancy shooting gear. Some Hornady, Federal/Norma, and some brass bulleted milsurp ammo.


Nagoya Series 27 Type 38 with a great bore, and matching bolt, etc.


O-rings


O-rings were reused until cut beyond servicability, usually 3-5 cycles.


Target 1J: Again first round on paper was "cold bore". As expected, it was high, so the following 9 rounds were fired whilst aiming somewhere around the "X" superimposed on the photo. Seems a little left correction is needed. (Fired LH)
Ammo: Hornady 139gr SP.

Max spread (9 rounds): ~5 1/4", but the best 7 were in ~3 1/2".

As a disclaimer, front sight focus was VRY tough! Allergies, presbyopia, and old lenses, sorry! But we gotta start somewhere.

For maximum gas protection, and better sight focus, the next five rounds of brass bulleted milsurp ammo was fired RH.

No O-rings used, nor were they needed! The primer crimps made closing tha bolt an effort. Fortunately, the "interrupted thread" locking face geometery was of great assistance. (Photo of case base to follow.)


Only three hits! Report was louder, recoil greater, and impact higher. 4" spread, for what it's worth.
One long hang fire, with reduced report and recoil-sights were on target, but no hit.
One misfire, but it turned out to be an odd duck round in the charger. (loose, not from one of the sealed boxes.)

Due to pierced primers (two or three), testing was suspended using this ammo. Firing pin tip damage is certain with continued use, and salt laden gases being blown through the action are undesirable.

Type 97 results coming- time pressures force an interruption.

Information

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