Thanks for everyone's thoughts on my question.
Does the type 38 use standard rifling or is it Metford? What is the difference?
I had a friend who was going to turn a barrel down to the carbines dimensions, thread and chamber it. I would have gone with .243 if this was done. However, he has since passed away so that idea is moot.
This would have enabled me to retain the original barrel and chambering.
I'll order dies and brass for the 6.5 Jap. I'll probably end up getting another 38 in rifle length also.
I guess it won't hurt to add another caliber to my reloading... I already load 24 different calibers. LOL