British muzzle velocity figures can be confusing to us Yanks. I remember reading Gough Thomas who reported the muzzle velocity of shells he was testing at 1070 fps. (Standard game loads.) That is "observed velocity," which is the average over 20 yards (or meters, I forget which.) Those loads have a velocity of 1175 fps as we measure MV on this side of the pond--which is at 3 feet from the muzzle. On the other hand, if you get a British MV reading in the 1400 fps range, that's almost certainly taken at the muzzle. "True" muzzle velocity, which is faster in comparison to our 3 foot velocity.
When shooting on cold days (much below freezing) on skeet squads with a shooter who's using those low recoil loads, they tend to sound decidedly "poofy". But then most shooters aren't as crazy as some of us in northern Wisconsin are. They're doing something other than shooting targets when it's that cold.
Last edited by L. Brown; 11/12/22 09:10 AM.
