.357 magnum smg

>what is 9x25 dillon
Lower mag capacity, less power in a carbine/SMG. But, pistol performance is impressive.
>what is 9x23 winchester
Non existent, worse carbine performance, and too high pressure.
It's weaker.

>Non existent

>implying 9x25 isn't

Not only are there feeding issues with a rimmed case, but there's also the problem of the round being too powerful.

SMGs are designed to be simple. They are usually straight blowback designs. That is practical with a 9mm or a .45, but beyond that you run into problems. You either need a bolt that weighs far too much, or you have to have a more complex breech mechanism which costs more and is less reliable.

Besides, what's the point? For the applications you need a SMG for, 9mm works just fine.

Not OP but what's so unreliable about feeding rimmed cases? Is it just the idea of potential rim jams that's the problem?

Submachineguns excel at a few niche purposes, but they are otherwise useless.

That, and they dont stack very well in magazines

>A rimless .357 would be god tier, could use cut down 5.56/5.45 case as a starting point since they're very close to .357 size
So....a .38 Cal carbine instead of .30...
meh, if you're gonna go big you might as well go .50 AE or .500 magnum

> SMGs are designed to be simple. They are usually straight blowback designs. That is practical with a 9mm or a .45, but beyond that you run into problems.
Wait though. The PS90 is a straight blowback action and 5.7 has roughly 80% more pressure than .357 Mag. It's base radius is only 10% smaller as well, so bolt thrust shouldn't be an issue there.

Is there some secret sauce in the PS90?

9x25 seems easier to make though, and barrels are more common.
Judt another reason roller delayed blowback needs to make a comeback. Though going with that you might as well neck it to .30 too.
>Besides, what's the point?
Hot .357 has .30-30 energy from a carbine, that's why. Think AP, long range and a flat trajectory, all of which 9mm can't do for shit.
>So....a .38 Cal carbine instead of .30...
What existing .30 pistol cartridge matches .357 from a carbine? But I said above necking .357 down would be great.
orions-hammer.com/blowback/
Learn. Pretty sure the P90 has some mild delaying mechanism though.

The P90 has a mild delaying mechanism (piston like spring in the back and a barrel that moves when fire) and 5.7x28 is also specifically designed for extraction under high pressure (the case is covered with this special coating that makes it next to impossible to reload for)

orions-hammer.com/blowback/
> Learn.
Thanks, still working on the math on that page. Oddly enough, the link shows .40S&W and 10mm with more bolt thrust and a wider base than .357Mag. Unless HiPoint has some super magic in their 10mm carbine, a .357 Mag blow back SMG (or .357 Sig to dodge the rim issue) should be fine.

Groovy.

Probably a blish lock.

>.500 Magnum SMG
are you the user that set the fucking woods on fire with napalm shells?

>orions-hammer.com/blowback/
I appreciate what this guy did, but holy shit, kilo-pounds and kilo-PSI are some next level stubbornness.

Rim

I think PDW show there is at least some demand for something the size of an SMG but with a bit more bite.

The P90 also uses bullets under 50gr

>the case is covered with this special coating that makes it next to impossible to reload for)
No you just can't reload like a retard.people reload it all the time, it's just very pressure sensative. It's also there for the feed mechanism of the magazine

Not him but:
I'm working on a .458 SOCOM pistol.

Yeah, I missed using the momentum of the bullet instead of just using max pressure * area. I noticed something was up when the peak force of 9x19 was higher than .357 Mag due to 9x19s wider case diameter.

Okay. Suck my balls.