308 Garands
Oleg,
There are aftermarket Garand barrels chambered in .308 all over the place. Gun Parts Corporation (Numrich) has 'em, Fulton Armory has em, and even Brownells has em. You can get an ordinary, run of the mill barrel for just over $100.00, or you could go whole hog and get a Match barrel for your baby!
Brownells used to sell a plastic block which went into the magazine (forward) to keep the 308 shells from riding too far forward in the clip while loaded in the rifle, but they've stopped carrying this piece. I have been told that this device isn't really needed, but I'd say the jury is still out on that one. Other than that, you can pretty much get her into action after swapping barrels.
I have a 308 barrel that is waiting on a rainy day, but it's short chambered, and will need finish reaming before it can be used in my rifle.
But this would all be for the normal length Garand, as the gas port, and all the other stuff on the barrel (threading for the gas block, etc. is still in the normal places. Once the barrel is swapped, I can hang all the old furniture off of it, and go shooting!
If I understand you correctly, your Garand is a shorty? Like a Tanker model? I would imagine that a good smith could shorten it (a 308 barrel) up, if that's what you needed, he'd just have to copy your 30-06 barrel.
But damfino why you'd want a shorty Garand! Like mine stock, as she's the best off-hand shooting rifle that I own!
Good luck!
Unkel Gilbey