Will a 6.5x68 fit? I have an action that is in very good condition. Intact Mum. I want to build a sporter with a flat shooting cartridge and open sights. I don’t want to cover up the crest.

6.5 x 50 Type 38
7.7 x 58 Type 99

I'd say it's 18mm too long. Probably too long for the 99 as well.

Well that sucks.

A .260 Rem will fit. What distance are you planning to shoot it? The Swedes shot their 6.5x55 Mausers at pretty long distances with open sights.

I think the Swede would be too long also. 6.5 Creedmoor is a shade under 49mm. Very nice action you have there.

The opening in a type 38 Arisaka is 78mm, probably the best you can do is a 6.5-284...as long as you don't use too long a projectile...overall length on a 6.5-284 is 82mm.
I have one in the standard 284.

Roger

Hmmm…6mm/284. Use lightweight bullets for a flat shooting SOB. Sounds cool.

260 AAR or a 6.5/257 Roberts. They have been built on Arisaks for years.

I have a 260 AAR in a Type 38 Arisaka. It feeds properly. The 260 AAR is a 6.5/257 Roberts blown out. With proper loading and at least a 24 inch barrel, velocities will be close to a 25/o6.

Either the 260 AAR or 6.5/267 Roberts would be a good conversion, subject to your intended use.

Geoff

I had one in 6.5 Roberts that used the military barrel(chopped to 19"), shot under 3/4 MOA with Plain Jane Rem 140gr bullets and Scot 4351 powder.
Building one now in 25 Rem Mag, only because the bolt was opened up to magnum when I bought it.

Bowboy B
Do ya remember how much of the 4351 ya stuffed behind that 140 grain projie.
I have been using old style Hornady 129s and the supply is all but gone.
If I can come up with a decent load, I have enough Remington 140s to use til they plant me.
After all that blather I guess we know that the Type 38 action will handle cartridges based on 57 mm cases, but I then I'm guessing that 68mm based cartridge is likely pushing it beyond the limit. Magazine length may really b the limiting factor, it is in my 6.5x257.

Just me, but since the 6.5X55 case has a larger base I would go with anything with the 0.473" base diameter instead.

LDO
as good as that action looks you may want to sell/trade it to someone trying to build a full military. It is a rare find in todays world and there are those looking for such!

You don't go by the nomenclate for the cartridge. The 6.5x50 Japanese overall lenght loaded was 76.00 mm (2.992 in). So that means there is a little extra clearance in the magazine so the cartridges can function in it.

Likely WAY too late now, but looks like the longest any I have loaded is 3.100.
That is pushing it a bit, I would plan on 2.9+ish.