I'm either confused or has your guns been reproofed ? If they were built in 1895 the proof marks would not have 2 3/4 stamped. It would have 1 1/8 or 1 1/4 and the words "nitro proof".
Chamber length were not stampped till the 1925 rules of proof .
Given the age I would have assumed they were original Black powder and were subsiquently reproofed at some later date.