Gunplummer,
Did you have any trouble with the Arisaka to 6.5 X 55? I'm considering this but would love to hear of any issues or trouble this conversion created. If you don't post bakc here I'll try a private message to you.
I see possible extractor issues, maybe magazine overall length restricting the loads of the 6.5 X 55 to 140 grainers or less without opening up the mag well .....
thanks