When you decide upon your load for your M1 Garand, you might consider getting an adjustable gas plug. The two most common are the Schuster and the McCann. However, you can get a ported gas plug from garandgear.com, that doesn't need to be adjusted. The above gas plugs, allow you to use virtually any 30.06 load up to 180 gr bullet.
If you want to reload, I would suggest using IMR 4805 or H4805 as your base powder. You may want to try some Hornady 110 gr spire point bullets if you are just plinking. Other wise 150 or 168 gr bullets are very common.
If you go to the CMP forum, there is plenty of advice about reloading for the M1 Garand. Pay particular attention to two posters there, lapriester and cerezco, they are very knowledable with their advice.