Years ago, when I bought my Garand, I too was faced with the, "what commercial stuff can I use?"....(Yes, I reload now)....On Garand forums the claim is, "never use commercial stuff!".....Not quite true....I took the time to call Federal, Remington and Winchester, and spoke to their technical support people..I also e-mailed them to get other responses and compare....
CAUTION: These replies are based ONLY on the ammo mentioned, and no others.....Also, no one at Tech support knew what the exact pressure levels are...
Federal: American Eagle-150gr-FMJ
"American Eagle is not loaded to milspec pressures, but many people use it in their Garands, and they have never had a complaint from the public"
Winchester: White Box-150gr-FMJ
"This ammo is loaded to military specs and I, (the tech), and other Winchester staff have used it for years without any problems"....
Remington: UMC ( yellow box or green/white box)-150gr-FMJ
"Our ammo is downloaded 4%, (like their .223 green/white box), from military spec pressure...It`s been used extensively by Remington staff without any problems, or complaints from the public"....
I have fired all three 30-06 ammo in my Garand, (quite a lot), and never had an issue..(it was cheap when I bought it)....I now use the brass to reload..
So take it for what it`s worth.....
Also, Northman999 is right...If you`re worried about the pressure levels, Brownells has pressure adjust nuts for about 40 bucks, and they ship to Canada...