No, Jim K, the member in question said nothing about shooting 7.7 ammo in .30-06 rifles he was adamant that the 7.7 Arisaka RIFLE was meant to be able to use .30-06 AMMUNITION in a pinch.
It is frequently said that the Makarov is meant to be able to use captured .380 ammunition. Right. Like which army still issues .380 sidearms? The Italians and Dutch quit a long time ago.