Holy schit, my point of discussion was missed by many and it went sideways.
There are a number of cartridges that have been around a long time and hence chambered in older actions and is down loaded. For example, 7x57 Mauser.
I simply asked if the the .30-06 was such a cartridge, NOT if it is still capable to kill stuff if velocity is not what it could be in factory loads.
This is a gun/hunting forum. You need to ask the opposite of what you are seeking for it to stay on topic.