.475 3 1/4" Nitro Express, not as popular as some of the other .475 rounds but every bit as good, introduced to use the .450 3 1/4" straight case following a general prohibition placed on that bore size by the British Sudanese authorities round about 1907, it was this ban that gave rise to a whole raft of calibres all of similar bore sizes but by different makers, each claiming superiority over their rivals. In truth many of the ballistic dsifferences purely academic more than practical. auumnition is offered by Romey in Germany and Kynoch made in the U.K so the rifle, depending on condition, would make a good buy for someone in the market for a well made double in a good big game calibre