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Dear Michael :

The only difference we know of is that early Tokyo production had 6 grooves while most post WW1 and WW2 was 4 grooves.
The best you can do is run a tight cleaning rod and patch and observe the number of inches traveled to make one complete turn, that will give you the twist rate. Most original ammo has projectiles in the 130 to 160 range. The caliber of 6.5 mm equals to a U.S. .264 and there are numerous weights to choose from. To be most accurate you need to slug the barrel to be sure it is .264 and if not adjust bullet diameter.
Vicasoto
 
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