My son picked up a Springfield Armory M-1 Garand at the gun show. He's chomping at the bit to shoot it but I'm telling him to not shoot "modern" ammo in it (don't go to Wally World and by Remington Core-lokt). I'm wondering what I can load for it that will shoot well but not tear it up. I realize that the Garand is a very well made weapon. I just want to be careful about what gets shot in it.