Home Forums Hunting & Shooting Handguns 30 Super Carry

Wonder how many rounds an AR pcc could get? 8-10 inch AR barrel 45 rounds in the mags that might be an improvement. Oh? I've never owned an AR at all just spitballin'. I should get an AR for giggles though.

So, you're saying the bark probably isn't any worse?

No, I'm just offering some QL predictions. I have no real idea how it will sound in reality.

H110 and equivalents (used in 22 WMR and 30 carbine, both revolver rounds) aren't flash suppressed powders and have basically been in use with those two cartridges since inception.
In revolvers they are obnoxious because of a cylinder gap. Sure, they are also louder in fixed chambers and short barrels, but not to the same extent. Neither is loaded anywhere close to 50k psi either, so I don't understand the fixation with the operating pressure. I'm betting both are still louder than the new Federal round because at the end of the day, they are still long, narrow revolver rounds using a h110/296 type powder.

FWIW Power Pistol was a non canister powder developed for the 9mm sometime in the 1980s for the 9mm. Its not quiet and its not flash suppressed.

I would venture that Federal is probably using a non canister powder that operates at 50k, is flash suppressed and not an Olin ball powder developed in the 1940s....

I was thinking along the lines of a Ruger PC carbine.

Dave wins the internet today!

What was said: S&W came out with a new round, the 30 Super Carry.
What Dave got out of it: I should get an AR.

That's awesome! I think that makes a perfect answer/response to a lot of questions/statements I hear. Way to go, Dave!

I agree Dillonbuck, CCI Maxi-Mags out of my 5.5" Single Six have brutal noise and muzzle blast. My hearing is already damaged from Flash bangs and 12" .223 fire inside crack houses. I must admit this round is intriguing though.

Ron

I wonder how much they'd have to beef up a Shield or LC9 to be able to handle a steady diet of 50k psi? .357 Sig and .40 S&W are a handful in a compact pistol.

Ron

If they were smart they designed it so maybe just a heavier spring. If you just take a Shield and convert it you're gaining a half mm in thickness on the chamber. No idea if that's enough though.

The 50K psi only tells part of the story. The units are "pounds per square inch" so in order to be meaningful you also need to factor in the square inches. "Bolt thrust" is the force applied to the breech face at a given pressure. The below is oversimplified but it illustrates the point:

.30 Super Carry = 0.0765 square inches x 50K = 3,823 lbs.

9mm Luger = 0.0990 square inches x 35K = 3,464 lbs.

9mm Luger +P = 0.0990 square inches x 38.5K = 3,811 lbs.

Sooo, although the Super Carry 'might' have 15K psi (43%) more than a 9mm, due to the reduced area of the case head the bolt thrust is only about 10% greater, and basically the same as a 9mm +P. Other factors, such as hoop stress, are similarly reduced due to the .30 Super Carry's smaller diameter.

In a similar handgun, the .30 Super Carry barrel weight is increased due to the smaller diameter bore. With the bolt thrust so close the handgun designers will hardly bat an eye.

Waders I said I was spitballin'. I will admit to not owning a S&W since the Ed Schultz days and capacity seems to be a marketing point with the 30super so natural extension is a pcc. We're still internet friends though.

This is just ammo makers supporting the natural evolution of concealed carry firearms.

We had compacts, then ultra-compacts, then micro-compacts - meet the new ultra-nano-compact.

LMAO 🤣

I want one.

Not much difference there in your calculations. Another thing I noted in my QL simulation, 50K was attained with only 5.9 grains of powder. So if that's somewhere in the ballpark, the overall gas volume will not be excessive, even though bore volume is less than 9mm. So it would seem reasonable that pressure will in fact peak and start dropping fairly quick.

Too late, you're now my guru.

I think you're correct. My bet is it will all come down to propellant choice and manufacturers seem to have a pretty good handle on minimizing flash and blast. Hand loaders might have fun with it though.

I wasn't so sure the diameter would offset the pressure in this case quite so nicely as for the bolt thrust, so found an online hoop stress calculator and played around with some numbers. It looks like if you take a 9mm barrel, and just make the hole smaller, the hoop stress is comparable to 9mm +P.

Don't do it Dave! I had one briefly and my dog wouldn't let me pet her until I got rid of it.

Something to consider is that a hoop stress value uses both the inside and outside diameter of the pipe/barrel. If the bore is decreased (make the hole smaller) while keeping the outside diameter the same the hoop stress can decrease even though the pressure increases.