Alexander Arms says their Beowulf barrels are .980 "under the handguard" and .906 at the gas block. I haven't seen a picture to see how far the .980 diameter extends.
For the muzzle end, Dunlap's gunsmithing handbook recommends .150" wall thickness at the muzzle for most sporting barrels. I'll have to decide how I want to extend the end of the barrel... right now, I'm leaning toward just turning a step on the end, sliding a brake over, and silver soldering.
Gharr! No use working on the barrel until I get it chambered. Can't chamber without a reamer. Can't order the reamer until I get some brass. Which has been back-ordered for six weeks already...
"You are in a maze of twisty little passages, all alike."