Did a little research today on building a .458 Garand. Then looked at building a semi-auto .458 on any platform. I think this is a VJJ Punisher skill level project. On the practical side, the .458 and 30-06 are exactly the same overall length. The .30-06 has higher pressures than the .458, so there isn't an issue with the receiver or recoil system being strong enough...in theory.. The bolt head would have to be opened up to accept the larger cartridge base, but that's pretty simple. The bolt locks into the receiver, not the barrel, so again, no modification needed. I guess I could probably do it, but it has the potential to become a money pit.
I may have just talked myself into it...and I believe I have an extra Garand laying around...or M1a