I have never head spaced a Garand. However, if I were, I would disassemble the bolt; replace the bolt(with out the extractor) back in the receiver; place the no-go guage into the chamber; slide the bolt forward and see if it locks up. It shouldn't. Do the same thing with a go guage. It should lock up. But don't take my word for it, as I said I have never head spaced a Garand before. You can moer than likely have it checked by a gunsmith for what the guages will cost. Troy