So the .577 Boxer and .577 Eley and maybe .577 Trantor are all the same cartridge(s)?

Given the variety of case lengths and types?

Perhaps should be defined in modern terms including the case length and maybe construction?

Eg .577 Eley 0.80".
Eg .577 Trantor or Boxer 1.2"

All based on the ,577 Snider.

These would Bevan interesting case, grass, original cartridges to collect it the many variations, construction etc.