It is interesting the Rigby literature claim of 3000'/sec for their .275HV in the Rigby Mauser Model #2 rifle. Perhaps a bit of "artistic license" as to the claimed muzzle velocity?

Other sources like John Taylor give a speed of 2750'/sec and Cartridges of the World attributed 2800'/sec.

Certainly the average hunter/shooter back in the day did not have access to any kind of chronograph, but hey, catalog speed sounded good and maybe led to spirited campfire debate?

One of these days I may be lucky enough to come across a vintage box of Kynoch .275 HV ammo and I will certainly sacrifice 3 rounds to my LabRadar chronograph and my original 1936 Rigby "Sighted For High Velocity .275 Bore Cartridge" rifle.

Personally, given the powders available in the 1920's & 1930's, I'm betting closer to the 2750-2800 number…..

- Mike