Magnum Caliber SMG?

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stonewall50

New member
I am just wondering if any exist? I understand that it has been eclipsed by SBR ARs and .223s. I am just wondering what else is out there. The idea of a .44 mag or .357 mag SMG is cool to me. Anyone?
 
shooterdownunder said:
A quick google only came back with two 22 mag ones. Couldn't find anything bigger and can't say i've ever heard of any.
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That is exactly what I saw. And I'm honestly surprised. I think the idea is cool. At least cool enough to make one. Not enough to be a staple of any army or police force. But still enough to sell. I mean...imagine the marketing? The mp357 or UMPmagnum or uzi mag? Lol. Mac Mag!
 
The money it would cost to design, tool up, and prototype just one of these would be more than the civilian market could fund.

If it was even legal, didn't the 1986 law shut the registry, no more full autos?

Let's not get into the controllability of such a thing when fired....
 
A Sig MPX gen 2 with a .357 Sig barrel and registered drop in auto sear or lightening link would probably be the closest you could get legally. I know the MPX uses an AR fire control group so that should work as long as the bolt carrier will trip or can be made to trip the auto sear.
 
There is a 10mm mp5

And the UMP comes in .45acp

If you know about the .460 rowland........

You could modify/strengthen a .45acp subgun to shoot .460 rowland. The .460R uses a case 1/16" longer than .45acp but the brass is much stronger and can handle much higher pressures. Overall length is the same. Can do roughly 250gr at 1350fps. Which is some serious power from such a small package. You can use the same magazines, would have to extend chamber and make sure chamber/barrel/bolt is strong enough. Increase the lockup time and any springs. Delay rate of fire. Imagine a grease gun or UMP45 shooting a 300gr bullet at 1100fps and at about 600rpm
 
Sorry, I've fired the Grease gun and AR 15 and I can't imagine firing them in 10MM or 460 Rowland. Makes me cringe just to think about such a thing.:eek:
 
stonewall50 said:
That is exactly what I saw. And I'm honestly surprised.
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I'm not surprised at all. Think about the purpose of most SMGs: A compact, lightweight, durable, shoulder-fired, select-fire carbine that is easily controlled under full-auto fire. Once you start going to bigger calibers, controllability gets much more difficult, size and weight go up, and long-term durability goes down. Not to mention the lower reliability of a rimmed .357 or .44 Mag cartridge.
 
1923 "Military" Thompson SMG for the .45 Remington-Thompson.
A 250 gr bullet at 1450 fps, but the barrel was longer than the standard 1921's 10.5 inches.
 
Two things from the OP: "Magnum" cartridges are going to require more weight and/or strength in lots of parts or some sort of "locked breech" design. Rimmed handgun cases are a real non-starter for such an application.
 
Mobuck said:
Two things from the OP: "Magnum" cartridges are going to require more weight and/or strength in lots of parts or some sort of "locked breech" design. Rimmed handgun cases are a real non-starter for such an application.
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That is what I don't understand. The rimmed case is the problem? How come?
 
Rim Lock

Well we could start with "rim lock" rimmed cartridges in a stacked magazine are problematic.
If the rim of a cartridge gets behind the rim of the cartridge directly below it the cartridge "rim locks" in the magazine, tying up the gun.
 
Ricklin said:
Well we could start with "rim lock" rimmed cartridges in a stacked magazine are problematic.

If the rim of a cartridge gets behind the rim of the cartridge directly below it the cartridge "rim locks" in the magazine, tying up the gun.
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See. I didn't know that. I still only have a basic knowledge of firearms. What other problems would there be?
 
The closest thing would be the Heckler and Koch MP5 in 10 miker miker.

I have often thought a .50 AE SMG would be great. Something like a gas operated SBR AR-15 with a double stack 20-30 round mag. Should be doable.
 
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Don't say the 10mm is dead, because it isn't true. The Feds had an MP10. the delayed action helped make the subgun somewhat controllable. A Magnum caliber subgun is not really practical.

I have been shooting for about 55 years (since the age of six). Father was a member of the Navy's Underwater Demolition Team and the Navy Rifle Team. As the son of a man with many years of firearms experience, he never really cared much for fully automatic weapons fire, preferring marksmanship over suppressive fire. He could do things with a rifle you would scarcely believe!

Having literally learned these lessons at "daddy's knee" from ages six through eighteen, I have gathered that strings of fully automatic fire have limited logistic purposes. father taught me that burts of between three and five rounds are the most effective, before "muzzle climb" raises the rounds into the air and over the target.

In my humble opinion, two rounds of magnum ammunition (at the absolute most) can be placed on target effectively.
 
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