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Arisaka Type 38 carbine question


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Hi ! I was recently given an Arisaka Type 38 Carbine by my neighbor ! While going over it, I saw  the receiver marked ““converted to 250-3000”. I’m assuming this means the Savage 250-3000 round that was probably commonly available at the time. My question is, can the rifle still fire the original  6.5x50 rounds without any issues ? I read on an older post that implied that it was interchangeable but the poster never stated the details 

Thanks a bunch ! 
Altan 

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The head diameter of a .250 Savage is .468", for the 6.5 Jap it's .455"

Even if the other dimensions were compatible (and they aren't) that .013" difference would probable result in a blown case head.  I don't know where the shoulder for a 6.5 Jap is located but it is almost certainly not as far forward as that of the .250 meaning another place to lead to a case rupture

That combined with the fact that the bore is .006" too large for the .250 Savage and will significantly reduce accuracy makes the whole thing a really bad idea. Your best bet is to get a chamber cast and see exactly what you're dealing with.  you may end up having to go with a 6.5x.250 Savage wildcat

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Dimensions taken from an older Sierra manual

I wouldn't touch that thing without a chamber cast. The shoulder on the Jap round is further forward than that of the Savage so a rechamber won't work unless the barrel has been set back.  The "normal" rechambering for these rifles is the 6.5x.257 Roberts (7x57 case) which will give a cleanup of all the dimensions

 

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Edited by StrangeRanger
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Gotcha ! Ya I’m going to take it and do exactly that ! There’s a barrel/receiver on GB right now too that’s not modified so that might be an option to switch out. 
 
I really appreciate the words of wisdom and taking the time to look into and share the drawings Sir ! 
 

Many thanks ! 
Altan 

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 ive seen several 6.5 jap rifles rechambered to 257 roberts, that was the fad when sporterizing  jap rifles back in the 1940- 1960s , a lot of write ups in american rifleman and other gun mags back in the day, just sayn

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