I have never been a big fan of switch barrel rigs. I see a lot of traveling hunters with their switch barrel Blasers but most of them are from Europe where it is tough to own very many rifles. The concept of a quick change barrel makes some sense on take down rifles like the Blaser, but changing barrels on a traditional rifle sounds like a headache to me.

With QD rings you could share a scope among different rifles and keep the cost down a bit.

Have you considered the 9.3x62? It seems to be the new (very old) hot choice for USA hunters. It is very common abroad and ammo is easy to find. Some local guys have screwed a new barrel on .270 and .30-06 rifles to use this grand old cartridge.