Try searching for "Garand" on these lists:
CBA Forum: http://www.castbulletassoc.org/forum/index.php
Cast Boolits: http://castboolits.gunloads.com/
There are probably others that would be useful, but I know that the subject of Garands has come up on these pretty often.
If you're not already successfully reloading jacketed bullets for your M1, and especially if you're new to reloading in general, then you might want to start with that. There are various issues with reloading for the Garand of which you need to be aware. You need to approximate the in-barrel
pressure of the .30 M2/Ball ammunition the Garand was designed to shoot (150gr FMG flat-base spitzer over something like 45gr of something like IMR 4895). And it's not very tolerant of much deviation: too low and the action doesn't cycle right; too high and the gas and operating rod system can be damaged. This article, http://www.charm.net/~kmarsh/m1reload.html
, will give you an idea of things about which the Garand maybe somewhat pickier than other rifles. The Hornady and Speer manuals have (or used to have) special sections on reloading for the Garand, and there's a lot of Garand reloading info available on various net forums (FiringLine, HighRoad, etc).