.30-06

https://blog.targetsportsusa.com/the-ultimate-hunting-checklist-ensuring-success-savings-and-safety-with-target-sports-usa/

I just got this e-mail from the CMP today regarding the use of .30-06 ammo in M1 Garands, 1903s, and 1903A3s. Basically, don't hot rod your ammo and be careful what factory ammo you run through them.