If one is going to shoot an M1 a lot it pays to get into reloading for it. This will save on ammo costs over time and will allow you to use loads which are safe, reliable and accurate for the rifle.here are some caveats when reloading for a Garand;
1. Always FL resize your brass to facilitate easy chambering and avoid the possibility of an out of battery detonation.
2. Keep brass trimmed to below specified OAL to facilitate chambering.
3. Seat primers below flush with the casehead to avoid slamfires as a result of the bolt face striking and detonating a high primer on feeding/chambering. Also, the Garand features a floating firing pin and the inertia of the bolt will run it forward with a possibility of hard impact on a high primer.
4. Use the correct propellants for the rifle. Stick to IMR4894, IMR4064 or H4895 in order to generate the correct gas port pressure to cycle the action reliably and without damage to the op rod. As a bonus these propellants will also produce excellent accuracy. Most commercial .30-06 ammo is loaded with slow burning powder to generate higher velocity. These propellants are not suitable for the Garand and may damage the op rod-an expensive replacement. Some folks use an adjustable gas plug when firing commercial ammo to avoid this problem. I cannot personally vouch for them as I either use reloads or a stash of MILSPEC .30-06.
5. Only use bullets in the 150-168gr weight range. The Hornady 150gr FMJ is the most accurate and cheapest of the non-match FMJ bullets and can be bought in bulk lots. 150, 155, and 168gr match bullets from Sierra, Hornady or Nosler are all excellent, but more expensive.
6. Don't try to get more than 5 firings out of a piece of brass. The rifle is hard on brass. It wasn't built with reloading in mind.
7. CCI No34 primers are MILSPEC for the .30-06 as they have a harder cup which mitigates the possibility of as out of battery detonation caused by the inertia of the floating firing pin striking the primer on chambering. That said, these are hard to find and I have used both the WLR and Rem 91/2 primers for many reloads w/o a problem. Again, clean the primer pocket and seat the primer below flush with the casehead. Federal primers are soft and shouldn't be used in the Garand.
The rifle should also be lubed with grease per the manual before firing. Folks should make sure that the op rod spring is servicable and within the specified length. A too short spring will case the bolt to batter the rear of the receiver and will not cycle the action reliably. A too long or extra strength commercial spring will cause cycling problems as well.