Developed in 1993 by Paul Roberts, the proprietor at Rigby at the time by necking up the 416 Rigby case to .458″ in order to give better penetration and knock down power than the 416.

Horneber Germany

450 Rigby made up by Ken Stewart in South Africa from modified 416 cases. Ken assisted Rigby with load and bullet testing. The loads were also used in Namibia for a buffalo hunt and therefore the cases had to be overstamped to comply with international regulations. Norma tested bullets by Stewart as well as Woodleigh from Australia.

Norma proof load

Wolfgang Romey, Germany