311 Imperial Canadian Magnum

Define feasible...
There was a thread last year that showed there are several of these guns around the country.
Even some ammo with a mad man running rapids in a canoe (art work on box) and allegedly a Sasquatch in the back ground of said artwork on the box.
Rob
 
Always thought this was just the .311 version of the .308 Norma Magnum, meant primarily for making a cheap super gun out of a P14. Actually had one at one time.

Grizz
 
Always thought this was just the .311 version of the .308 Norma Magnum, meant primarily for making a cheap super gun out of a P14. Actually had one at one time. Better be a hand loader cause you won't find them at the local hardware store. :)

Grizz
 
^ isn't that the .303 epps?

The .311 imperial is based on the same case as the other imperials which is afaik identical to the RUM cases.

I know of one guy who owns one, grizzly guide in NE BC his rifle is based on a sako action iirc.
 
Who would want one.......are there any 311 bullets out there that will withstand 3300+ fps ?
Epps cases were all based on an improved 303 Brit case AFAIK..........
The 311-308 NM was called the 311 PMM..........poor man's magnum
 
According to the owner I know speer did a run of 200 grain bullets for the caliber.

I agree with you though, especially considering there are .338 and 30 cal options on the same case.
 
I believe one of the original designer of the Imperial Magnums - Aubrey White - is a member here.

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.
Click to expand...
 
'Boo said:
I believe one of the original designer of the Imperial Magnums - Aubrey White - is a member here.
Click to expand...

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.
Click to expand...


Werent these built on Sako actions? If not --- was pretty sure there was one western Canadian outfit that built rifles on Sako actions....no? And on the same subject there was a US firm that built folding stock rifles with Sako actions that I cant remember now....edit to add ... just remembered it was the Grendel SRT 20F
 
Last edited:
Judging from the replies you're getting some good information to work with. I have a P14 as well. It is a Winchester P14 sold by BSA. From what I've learned and from shooting it I can agree with the expert gunmakers that it is a very strong capable action that can be reworked into a modern rifle. I'm commenting just to share my experiences with my love of antiques. I'm supposing that when you say re-chamber that you hope to use the same barrel which is now 303 British with a .311 bore. That is a reasonable thought but as someone stated Imperial has not been around for a long time.
I am not pleased with the way mine groups with the typical available winchester 180 gr ammo. I have even had a tumble where one hit sideways. A trait that is apparently possible with any 303. I am going the other way, ( the rifling is almost perfect ), with handloading lighter 150 gr Sierras with some H331 powder. Other users have had good luck with that combination. Perhapslater in the year I can share the results if you are interested
 
I remember a gun magazine running an article on the Imperial Magnums, I always thought they had a certain charm, never owned/nor shot one, but I guess the fact that I grew up with Imperial brand ammunition added to their appeal :)
 
Where the Imperial magnum line of cartridges not based on a .404 Jefferey case? Copied somewhat by the RUM's...........Harold
 
Last edited:
Certainly sounds like a fun gun. As someone else pointed out, does anyone make a bullet designed for those velocities? I guess if you're only punching paper, it shouldn't matter.
 
So, just out of curiosity, other than sentimentality, and possibly simply rechambering a .303, what would the advantage of a 311 be? If it's basically the same case, would a 300 RUM be everything the 311 is and more? And I am really just asking here. Or is it a case of doing it just because it looks like fun?
 
You must log in or register to reply here.
Back
Top Bottom