308 winchester or multi calibers

Winchester 70 long action in a sniper stock. Was assembled with a barrel nut in 308 winchester.  Barrel is 16.5 inches with 1-10 twist blue. I can put a 6.5 creedmoor 24 inches bull SS barrel instead of the 308 or i can put a 300 win mag blue 26 inches barrelled action on it. If you take it like this it's 1150$, with the 6.5 creedmoor it'll 1350$ and finally in 300 win mag, 1400$ if you take both barrelled action plus the 6.5 creedmoor barrel it'll 2200$; 2 barrelled actions, one 6.5 creedmoor barrel. You'll have to change the follower frome one caliber to another but right now i don't have any. Muzzle thread 5/8-24 on the 308 and the 6.5 creed. Only need a savage nut key to unscreew and change barrel.