"In the 20s some company was converting them to 30-06 here"
I never heard of that, although it was done with 7.7mm Jap service rifles after WWII. Maybe that's what you mean. Converting an M-N rifle to .30-'06 would be very difficult, bordering on the impossible, as the 7.62X54mm chamber is a lot fatter than the .30-'06, the bore has a larger diameter, and the bolt face is also much larger. Also, the .30-'06 cartridge would not work in the M-N magazine. Not that it couldn't be done (with enough money and time you can convert anything to anything else), but it wouldn't be worth anywhere near the effort required. Huge numbers of US-made surplus M-Ns were sold to civilians in the US after WWI, but I don't think any of them were converted to .30-'06.
There were M-Ns made in the US during WWI for Russia, before the Russian revolution, and a great many were made here but never shipped. Some were used by the US Army for training during WWI, also, there was limited use of them by US troops in a combat role, though not many know the story about that.
The M-N was actually a very good combat rifle, comparable in every way to the US '03 Springfield and 1917 Enfield rifles. Just uglier.