I have a Remington 700 XCR ii chambered in .270. If i were to buy this barrel would this barrel fire the 300 win mag or 30-06 cartridge fine? If i would bring it to a gunsmith would he be able to modify my bolt and action to #1 use the 5R 20in barrel and #2 fire a 300 win mag or 30-06 cartridge with my .270 action and bolt? Sorry if this is a noob question. Im really into gun but im not educated in changing out 700 barrels or changing calibers.