Hi Chris if your data is correct should indeed have carry capacity of zero as it stands its an APC. The unit number is 746 though you gave a howitzer.
Only looked because didnt recall type 70s in OOB
EDIT
Actualy your last link states at the bottom 19 tube MRL carrying 19 rounds nothing about reloads though it is turret mounted so might reduce carry capacity.
The first link is a bit contradictory to in that in several cases it states space is taken up by fire control but for all of these under fire control lists NONE. not sure how NONE takes up space
