You know they have websites where they list all the dimensions, right?
Tons of guys using carbon barrels with cans. No issue. Some of the cheaper rimfire stuff is carbon tube held by the muzzle device. All the centerfire is carbon wrapped and bonded with decent chunks of steel on both ends too machine to your liking.
Of course, I hand load everything so I've never been very concerned. I just do all load development with the can on and use the same can for the life of the barrel.
not all carbon barrels are created equal. its why i asked.
Show me a diagram of a proof barrel that doesnt say "to be removed by gunsmith" instead of a dimension at the muzzle end