Taking the time to read the papery posted Woodenhead and the first sheet stood out to me regarding the Tennessee Sabot (Mullane) shells. Item II states:
He will also request Lt. Cunningham to call in all the rifle projectiles with the Tennessee Cup as soon as possible and substitute for them projectiles with the Parrott Sabot.
SO it sounds like they recalled the Mullanes and presumably melted them down to be recast as Read shells. They must have been really ineffective for them to go to that much work rather than just fire them and get Reads to replace them. But perhaps this is a fort or similar where the chance of use was low but they wanted the have effective projectiles. Another big plus and it might have been the driving need was to reclaim some copper to put to better use.
I also thought of the very neat Mullane that Mike has where they converted a Read shell to a Mullane. Here is a similar projectile from Jack's web site:
http://www.civilwarartillery.com/hap/page137.htmbut it is a Dahlgren that was converted.
