what you have are brass cases for .45 and .54 cal sharps replika rifles. because there 4 or 5 different maker over the last 30 years and all have different chambers for rifles and carbine's there are also lot of different brass cases. not so popular in the states but most sharps shoter's in europe use such brass cases.

dixie gun works had have all the cases for breechloaders with seperat priming once and I have them laying around here. here are pics from the dgw site for some of them

.54 Burnside

.50 Gallagher

.50 Smith

.50 Smith plastic - copy of the orignal black rubber case