What to do? Re-barrel or sell 'n buy another?

[yobuck]

I have a Savage M-10 LE Precision Carbine in .223. It's a great rifle and shoots very tiny groups using Varget and 68gr. bullets.

What I'd like to do is "move up" to a 6mm cartridge.

Any thoughts on this?

I would just keep what you have and get another gun. Later i would get another in yet a larger cartridge.
Otherwise its sorta like selling your 1/4 “ wrench in order to buy a 3/8” wrench.
Better to have all the different size wrenches you might use.