+1 As mentioned above.
You rough chamber the barrel slightly short, mount the barrel and finish ream it in the action.

If the chamber is long then you have to set back the barrel and maybe rethread it.

Why you would rather do that is beyond me.

Go for the nut.

If later you change the recoil lug then you start over again.
Nutless barrel to me is sort of like do it once, and dont touch the rifle for years and just shoot it.