The .577 Nitro Express, originally a popular black powder cartridge of the 1880's had a 2.75" case which was later altered to 3". Shortly before the turn of the century the current 3" smokeless version was introduced and for a period the shorter version was also loaded as a smokeless round. Both are now available from Kynoch but the shorter 2.75" is by special order. 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.