Thanks folks.

I forgot to post the dimensional data of the 3 cases.They are all unfired.
Note the inside neck diameter

from left to right:

lenght 61.52 mm 42.01 mm 36.28 mm
neck diam 12.50 mm 14.75 mm 14.81 mm
base diam 12.59 mm 15.43 mm 15.43 mm
inside neck diam 8.64 mm 10.81 mm 12.33 mm
marks on the body U 517 451 U 517 54B U 517 54A