I know that the original Imperial cartridges were designed by Aubrey White , a Canadian guy that made also custom rifles in the 1989 - 1993 period.
In COTW is written that NASS now produces some very similar cartridges called “canadian magnum” but other sources say that the two lines of cartridges actually interchange . Is it true?
I know that the original Imperial magnums came in 7 mm , 311" , 338" and .358" ( .360) caliber , but COTW lists the 7 mm , 300 ( and not 311) and 338 Canadian magnums . NASS ( according to COTW) eventually marketed a 375 and a 458 version of the basic case too in 1994 .
What was the real relationship between the original Imperial rounds and NASS with their canadian magnum cartridges?
There is very scarce and contrasting info on the web