1927 6.5×50 Japanese .

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RBHarter
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1927 6.5×50 Japanese .

Post by RBHarter »

6.5 Japanese Arisaka , type 38 , manufactured Sept-Oct 1927 , .257×.268 net bore groove , .280 throat , 19.5" barrel , 1-9.5 advertised .

The first loads were all 9.9 gr Unique and CCI 200 LRP
277-130 Lee formed and turned 243 brass this ran 8" and was the last fired .

.260-140 NOE in formed 35 Rem , this was second and ran just over a hand width . Lubed in the bottom 2 grooves as cast loaded out touch with 2 grooves out of the case at .272-150 gr 6.5 Hornady checks . I didn't take an OAL but it fits in the magazine , feeds , and lets me get a loaded round out still loaded .

The first load was a 280473 sized .278 at 122 gr with a 270 GC with the bottom band just in the case . This one was all over about a foot high and 18" wide it also had blow back so bad that one case looked like a golf ball . In formed 35 Rem .

This was an introduction to the rifle , I've never shot an Arisaka and it's been longer since I had a long travel 2 stage trigger . It's probably around 7# at the break .

Today has me loading a few in paper patches in Norma brass sized .266 and wrapped to .274 . It's not ideal but I'm working with tools available for now .

Bullets loaded today are the 280473 and 266469DV @ 140 gr over the same 9.9 Unique I'm contemplating continuing on with the 266469 patched with start loads of I4350 and/or H4831 just to see if I can cut some of the frost off . My cheap phone cable bore scope shows a lot haze and a few goobers at this point . I'll break out the 0000 wool brush .

It cleaned up easy I'm actually kind of surprised , but maybe I've had enough practice that I scared it clean . ;) It was much smoother so maybe what I thought was goobers is just pits troweled in .

I went ahead and loaded some 36 gr H4831 from the repacked in 74' WWII surplus powder just about under the PP 266469 . I have 2 of them now 1 drops .266 and the other came with bullets at .268 . Of course I have no clue what that alloy might be ....

No ammo %@*&$ , I got called to work a half shift for an upchucker . So I'll get some in the morning .
Just a Red neck,White boy, Blue blood American.....
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Re: 1927 6.5×50 Japanese .

Post by RBHarter »

Cartridge pics .

30-06' , 266469DV , dry patch , dry patch , 280473 , 6.8 SPC for scale to the little 6.5 .


2 rows of Unique loads and 35,35.5,36 gr of H4831 a start load for 160 gr jacketed .
The 266469 scales 150 gr patched .
IMG_20210205_094250257~2.jpg
The 266469 is a Loverne bullet . Thank you Larry ! The single mould these came from drops .2655 the double casts .2667 . These are sized with what I have to work with , .265 then dry wrapped up to .273 . It's complicated to write down but it worked in a X39 that would chamber an 8mm bullet .

The NOE 270-140 wasn't bad but left a lot of barrel trash due I think mostly to barrel condition .

I really don't have any expectations of accuracy for these 25 rounds . I was less than careful with the patch wrap , the brass is formed for another rifle , at least one case has a possible neck crack . I didn't think about annealing the necks until after I had half of the cases loaded ...... Next time if I don't blow them out .

Note the formed 35 Rem chambers great its about .07-8 short and doesn't eject well .
The formed 243 should be great but I need a neck reamer , necking up 250 Savage or 300 down would probably be better . I smashed a couple of cases down . It should be pointed out that the Japanese is a semi rimmed .442 head with a .473 rim so to use a Savage , 308 , Mauser cartridge one has to swage the head down .03 inches to get it in the chamber . I have a real appreciation for the Big Max A4 now . It's 1 pass sizing down .
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Re: 1927 6.5×50 Japanese .

Post by RBHarter »

Today I guess I can't get 2 pics in the post .......
06' , 266469 , dry wrapped Japanese , dry wrapped 280473 , 280473 , 6.8 SPC for scale .
IMG_20210205_093929548~2.jpg
Both bullets were sized .265 the 280473 loses its grooves and most of the step to that special looooong gas check shank .
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Re: 1927 6.5×50 Japanese .

Post by larryw »

+corn +corn +corn
A day late & A dollar short? Story of my life +guns
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Re: 1927 6.5×50 Japanese .

Post by RBHarter »

Well I shot 25 paper patched .
The 280473 , I checked the mould number , shot about 4" with the Unique . I think with some attention to the details and proper formed brass that might be closed by half . Some load tuning probably wouldn't hurt anything .
The Unique 266469 shot 16" high and the 2 that hit the backer were sideways and just 46" apart it's hard to get a ctc measure when the 1-1/4 × .270 holes are turned 60° apart . :lol:

With the 266469 sized .265 and patched up to .273 and booted with a full snort of H4831 I really expected them to just ride over rifling and tumble like the lighter loads . To my delight the the 35 gr charge went into roughly an 8" triangle .

35.5 made about a 4×6 football . Both about a foot high .

36 gr started off good but then fell apart , I'm pretty sure it stripped at least part of the rifling it made round holes but over 18" .

The dark bore did clean up and that was the biggest goal .
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