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No I haven't. Actually, when I shot my match to qualify for an M-1, I was using a Mexican Mauser (short action) barreled for .308 (7.62 NATO).

Care to share?

A casual shooter can expect to shoot around 400 or less with a Garand. Around 430 or less with a M1A. An out of the box Colt HBar can let someone who hardly shoots but knows the basics get a 450 score.
Did you ever use that Garand in a regular High Power match? If so, what was your score?
My experience told me that accurizing a Garand is a waste of time and money. Shooting a Match Grade M1A is a lot of fun but after a while, they need a lot of expensive re-work done.
There will never be a good book on accurizing the AR that isn't filled with reloading data. Except for buying a trigger and making sure the front sight isn't loose, there isn't anything that needs to be done.