For a second M1 Garand, I'd look hard at finding one chambered for .308/7.62. Mine seem less blasty than their .30-06 siblings - and with their Criterion barrels, they've all proven to be very accurate out to 300-yds, the furtherest I shot them.
Not to mention if you don't reload, finding surplus 7.62 or commercial .308 FMJ will be easier and cheaper than chasing down so-called 'Garand-safe' .30-06 ball ammo - at least in normal times. Admittedly 2020 has been a shit-show for the ammo market, severely skewing prices and the availability of popular cartridges. Even still, going forward there's no downside to having a .308 M1.
One of mine rides in my truck, affixed with an Olongapo M1 stock pack holding two loaded clips. Under the back seat are 4 bandoliers of clipped ball ammo. It's sort of a 'beater' and impromptu range plinker, or for go-to emergency use.