Do not ever shoot regular 30-06 hunting ammunition in a standard M1 Garand. Commercial 30-06 ammunition is loaded to a much higher pressure than the “Cal .30 Ball M2” that the Garand gas system was designed for and simply will not work. At best, commercial ammo will cause a stuck case and at worst will bend the operating rod and/or break the extractor.
The last volume source for M2 Ball equivalent military surplus ammo was Greek HXP which was happily non-corrosive, unlike WW II and Korea vintage U.S. military surplus.
As surplus HXP started to dry up Federal came out with 30-06 ammunition loaded to Garand specifications. The boxes were printed with a picture of a Garand and the part number had an M1 suffix. Since then two other manufacturers have realized that with 6 million Garands floating around and Fulton Armory making new ones there is a significant market. The three current sources are:
Federal /American Eagle AE3006M1
Sellier & Bellot SB3006M2
Prvi Partizan PP347
A web search will turn up multiple ecommerce sites for each.
If you’ve never shot an M1, don’t pass up an opportunity. There are few firearms as much fun to shoot as the Garand.