I have a rifle chambered in the 270 WSM and would like see if it can be re-barreled to 6.5 Remington Magnum. Looking at the spec. from both cartridges , they are very similar in size so I would assume the action should work, but I’m not sure.

The other possibility was maybe 6.5-284 but the dia. of this cartridge is little smaller.

Both 6.5 R. M. and 6.5-284 cartridge measure 0.070” longer then the 270 WSM. Would this be a problem?

Would anyone know for sure on either one ? ...

Thanks