Can a 458 action be used on a 338 barrel to change calibers?If not what could be built on a 458 action without to much trouble just a rebarrel job?What actions are the 404 & 416taylor built on?Also can the 416remington action convert to a 8mm remington magnum with a rebarrel?What can the 416 remington action be converted towith out a lot of trouble?