Thisis something I got from my Dad, (WWII Navy), and it is way outside of my area of interest, (since I was a Ground Pounding, Mud Puppy, LRP). It looks like there was never a [non-threaded] primer installed, it is steel [magnetic] 8 7/8" long, 2 7/16" across the rim, 1 3/4" dia mouth.
And then there are these. Not quite “cartridges”, but odd Navy Things.
Aluminum, (or at least non-magnetic), 2.45 pounds, 8 1/8" long, 2" wide on the front end. The opening is slightly recessed in front, .937" dia., and .850" dia. between the fins, no threads.
There are raised numbers on them:
170133-B-1 with a small “U(anchor)S” just above the ‘B-1’
The recesses at the top are 1.5" dai., roughly .6" deep, with these marks in one recess on each: