Most Canadian cartridge?

SHELL SHUCKER said:
Here's some info.
https://www.cartridgecollector.net/311-imperial-magnum
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311 IMPERIAL MAGNUM



In the early 1980s Aubrey White and Noburo Uno of North American Shooting Systems (NASS) based in British Columbia Canada began experimenting with the full length .404 Jeffery by reducing the taper and necking it down to various calibers such as 7 mm, .308, 311, 338, 9.3 mm and .375. These cartridges were known variously as the Canadian Magnum or the Imperial Magnums. Rifles were built on Remington Model 700 Long Actions and used Macmillan stocks. Cartridges were fire formed from .404 Jeffery cases with the rim turned down, taper reduced and featured sharp shoulders.

Both Remington and Dakota Arms purchased the formed brass designed by Noburo Uno for use in their own experimentation and cartridge development. In 1999 Remington released the first of a series of cartridges virtually identical to the Canadian Magnum cartridges which featured a slightly wider body, increased taper, and shallower shoulders and named it the .300 Remington Ultra Magnum. Dakota too released their own version of the cartridge but chose not to turn down the rim and shortened the case to work in a standard length action. Remington would go on to design their own shortened versions of the Ultra Magnum cartridge which they were to call the Remington Short Action Ultra Magnum or RSAUM for short.

The history of the Imperial Magnums are also discussed in detail in IAA Journal 430, (March/April 2003)
 
What about tge 458 Watts? If memory serves, Watts was a Calgary area gun plumber who blew the 375 H&H
out straight. He chambered grizzly rifles in his new round.
Dunno how many he built, but a famiky friend says he has one that he carried when camping in the Rockies.
The 458 Lott didn't come about until the late 1980s, I believe.
 
I will humbly submit the 12 gauge 2 3/4” with a birdshot load.
Other than the .22 rimfire; the most commonly discharged round for gravel pit or farm fun, small game, birds and pest control.
About as innocuous and useful as it gets for a regular joe.
 
Canadian cartridges tend enter with little fanfare and fizzle out fast. The Imperial Magnums were a great concept but could not compete with the traditional mainstays and the Weatherby lineup.
 
tokguy said:
It does have it's 'haters' and we didn't pioneer it...but it's gotta be a 303 br in my world.
They ain't perfect... but they are prolific.
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Yup, totally agree.
The fact that it has been around that long and in such abundance and is still cleanly killing animals and being used inn vintage matches, regardless of why, cannot be refuted:dancingbanana:
Cat
 
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