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Do big guns; (tank/artillery) use a monster size reamer for chambering?

In todays modern machining world ; cutting a bottleneck chamber for a Abraums barrel could be done with a large CNC Lathe , and it could cut not only the correct profiles , but give a micro-finish cut that nearly could equal a reamer finish . Considering all the implications , I'm guessing that's how it's done . A Boring bar ; holding multiple bits , to take multiple cuts per pass , would be the requirement , to get a consistently finished chamber . With one final "finish Cut" pass , with a dimension in the range of +0.020 / 0.000 . Chamber could then be polish Honed . No Sweat , G.I. !
 
How much JB does it take to clean one of them big ones o_O?

A lot. Especially using CLP instead of JB. Wear a crew out scrubbing a tube all day.

I doubt the chamber has to be that precise, it's made up of multiple pieces, not a single chamber cut into the tube. The case is cardboard so any roughness has nothing really to catch on, and there is a ton of slop when you shove a round in, until you get to seating the base, which has a rubber seal.
 
I work less than a mile from the Watervliet arsenal. Future son-in law works there.
I have worked on site there many times (outside service) but never worked in the forge area.
They have some monster lathes in there!
Not quite the precision required, perhaps, but consider the fixtures required to bore out the forged 50-ft propulsion shaft sections in a modern aircraft carrier:

http://forum.accurateshooter.com/th...n-rifled-barrel-better.3996053/#post-37678767
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