Rechambering and re-throating the 6.5 Jap to 30-06 was an armature mistake, but it did happen now and then. (made them into 6.5 -06s without using 6.5MM bullets in the ammo. Unreal! But it was done. I personally saw one done that way, the the man who had it was the son of the GI who brought it back from the Pacific, and had been shooting it as a 30-06 for 35 years before I saw it.
Here is another such story which was in out local news just recently
https://county10.com/lookback-japanese-arisaka-type-38/
I can assure you all, a 700 is NOT as strong.