Dutchman,
Already some good advice here.... and I'll throw my own 2 cents in.
As determined by the designers of the M1 and the Army's ballisticians, and then told to the NRA way back in the late 50's-early 60's when M1's were first becoming available to civilian shooters for Highpower comps..... there are some definite ammo issues with the M1 rifle. The M1 is a very sturdy design, but the gas system is made to handle only a very narrow range of pressure as the bullet passes the gas port.
Shooting ammo with too low a gas port pressure will causes short strokes and FTF's. Ammo with too HIGH a gas port pressure can cause "bad things" to happen. Ammo that may be only slightly over the "safe edge" can, over time, cause the op-rod to bend or warp, begin rubbing wood, and sending accuracy South. Going a little higher on the gas port pressure can cause battering of the receiver heel by an over accellerated bolt, cracking it out. Bye-bye receiver. You now own a unitized parts kit. Get way up there and you can do some "instant" damage by immediately bending or breaking a rod.
In order to stay "Gas System Safe" in the M1 the rules are:
1) NEVER shoot bullets HEAVIER than 180 grains
2) NEVER shoot powders SLOWER than IMR-4320
The problem with commercial hunting ammo is that even if you are within rules on bullet weight, there is no way to know what type of powder is in the round. Commercial ammo makers do not use cannister grade powder (having very consistent burn rates from lot to lot) like us handloaders do... they use commercial bulk lot powders that have widely varying burn rates. They simply vary the charge weight of the powder they are using to match the spec velocity of the ammo load they are making that day.
Even if by chance you could determine that the box of hunting ammo you have in your hand today is safe for the m1's gas system (and I DEFY anyone without access to a full ballistics lab to do so) the very next box you buy in your local Sporting Goods dept. may have come from a different lot...and a different lot of powder... burn rate unknown.
Please note: The Winny Supreme 150 grain ammo at 2900+ fps may indeed be safe for the M1. It may not. I don't know either way. Don't have a clue as a matter of fact.... but 2900 fps is plenty hot for a 150 grain 30-06 load. I do know that any type of 30-06 ammo that is marked as "Lite Magnum" or maybe "Plus P" or some such nomenclature derived to denote that this ammo has more velocity than "normal" ammo is NOT going to be something you want in your Garand. The ONLY way to generate the velocities that are being advertised is to use powders that are way too slow for the M1's gas system.
There have been anecdotal reports on various BBS of these types of ammo being fired in the M1 and snapping an op-rod with only one shot, causing bending in others. Are they true??? Who knows... some may be, others not. Why take the risk when you know ahead of time the issues as outlined by THE PEOPLE WHO DESIGNED THE RIFLE???.
Military M2 ball ammo and the M1 rifle are literally "Made for each other", M2 ball having just the right pressure for the M1's delicate gas system.
All I know is that in MY M1's the only factory ammo I will shoot is M2 milsurp.
Now having said all this...... Why not just install a McCann or Schuster adjustable bleed lock screw in your M1 and shoot anything you want.....
Just my thoughts...
Swampy
Garands forever