Here is picture of my big 585 cases.
30-06 for size comparison.
3rd is 585HE - I have it in bolt, falling block,
break, etc, actions.

1st is 585 Hubel Super Magnum - Designed
for strong bolt guns. Have in a MRC PH.
Can get 20,000 ft lbs.

2nd 585 Rimmed Hubel Magnum and I have it
now as a single shot in an 1887 Win.
The 87 has a 30" heavy barrel. Case is
designed to use in break actions and run about
25,000 psi, but due to the size of the case
has enough powder so can get 15,000 ft lbs.
It is 4" long, could be called 24ga FH.Ed