Remeasuring more carefully (not standing in the closet and looking under poor light). The very end of the muzzle is closer to 0.735". 11" back from the muzzle is where the handguard ends, and it is 0.854" there. It appears that taper continues until about 18" back from the muzzle, at which point the barrel becomes closer to straight and is about .0937" and gradually reduces to 0.934" at the breech.
So, you have a taper of about 0.6 degrees. The edge where the taper meets the straight portion is blended, so it is difficult to determine exactly where the transition occurs?. Deflection from the contouring lathe may make the cylinder slightly narrower at the breech end, accounting for the 0.003" that goes missing back there?