"...tightened the barrel as much as I could..." With what? You have a barrel vise and action wrench? Using anything else can twist the receiver. There's no fixing that. You may be best to have the barrel installed by a smithy.
"...Can any .30-06 gauge be used for the Garand?..." Yep. There are other cartridges that use the same headspace guages. .270 Win for one.
Throat erosion has nothing to do with headspace.
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