9mm PCC 16" barrel velocity vs. 9mm pistol 5" barrel velocity?

[ysr_racer]

I've heard a 16" barrel costs you velocity over a 5" pistol, so I chrono-ed my go to load yesterday.

124gr RN jacketed bullet, 4.2gr Win 231, 1.125 Coal

Para

Name: 9mm: 124gr Zero RN: Win 231 4.2gr: Mix Case: OAL 1.125 Para
Notes: Para 1911 5"
Shots: 4
Average: 1089 ft/s
SD: 9 ft/s
Min: 1075 ft/s
Max: 1097 ft/s
Spread: 22 ft/s
Power Factor Average: 135
Power Factor Low: 133
Power Factor High: 136
Barometric Pressure: 30 in Hg
Temperature: 63 F
Weight: 124.0 gr.
Powder/Wt: Win 231 / 4.2
Bullet/Wt: Zero / 124
Primer: CCI SPP
OAL: 1.125
Gun: Para 5"

PCC

Name: 9mm: 124gr Zero RN: Win 231 4.2gr: Mix Case: OAL 1.12 PCC
Notes: CMMG RDB Radial PCC 16"
Shots: 4
Average: 1163 ft/s
SD: 13 ft/s
Min: 1151 ft/s
Max: 1183 ft/s
Spread: 32 ft/s
Power Factor Average: 144
Power Factor Low: 142
Power Factor High: 146
Barometric Pressure: 29 in Hg
Temperature: 92 F
Weight: 124.0 gr.
Powder/Wt: Win 231 / 4.2
Bullet/Wt: Zero / 124
Primer: CCI SPP
OAL: 1.12
Gun: CMMG RDB Radial PCC 16"

[FNGGlock]

I did a similar test a while back for bunch of different factory ammo. Seems +P and 115gr gains the most out of a PCC length barrel.

https://www.calguns.net/calgunforum/showthread.php?t=1779957

Pending on the data source and tests, it seems you gain little if anything past 10-12" of barrel with 9mm. Didn't notice much of a loss if the length continues to 16" in those sources.

But overall marginal gains from a 5" pistol to PCC length maybe 10-20% increase in energy, vs a 357 Mag that can easily gain up to 50% in kinetic energy for a good load.

At least you didn't loose anything.

Any difference between delayed blowback vs straight blowback PCCs?

[Jack Straw from Wichita]

http://ballisticsbytheinch.com/9luger.html

[Kokopelli]

Surprising you didn’t gain a full 200 FPS out of the carbine. Where I’ve heard you lose velocity out of a 9mm carbine is with the heavier projectiles like 147 grain jacketed stuff. Powder is all burned before the 147 leaves the muzzle and frictional drag sets in, slowing it down.

I believe a larger charge of a slower burning powder would be most beneficial. That is why I sometimes use Blue Dot. WW231 saves you money, works great in a 9mm pistol and is accurate. So there are trade offs. A powders that works excellent and is between 231 and BD in the burn rate tables is Accurate #5.

I don’t own a chronometer so I cannot report on my velocities. But hitting 12” steel plate at 135 yards is easy with my Ruger PC carbine.

[ysr_racer]

.

At least you didn't loose anything.

Any difference between delayed blowback vs straight blowback PCCs?

Agreed.

In terms of velocity or recoil?

Velocity, I haven't tested it in my direct blowback yet. Today was delayed blowback.

In terms of recoil, yes. If you shoot PCC class it's worth the cost to convert. Much less dot bounce. If you're just going to the range to have fun, no not worth it.

[sigstroker]

False!

I shot factory 147's, which are subsonic according to the box, out of a PCC with a silencer on it. Supersonic crack.

[ysr_racer]

False!

I shot factory 147's, which are subsonic according to the box, out of a PCC with a silencer on it. Supersonic crack.

What do they chrono at?

[sigstroker]

Faster than the speed of sound.

[ysr_racer]

Faster than the speed of sound.

Are you a biologist of physics?

[Beetle Bailey]

I didn't take detailed notes, but I did get some measurements with my friend's Lab Radar. I shot Blazer Brass 115 gr FMJ out of my Glock 17 and got around 1150 FPS (5 shots) and then tried the same ammo in my Ruger PCC, which yielded about 1350 FPS (also 5 shots).

That extra 200 FPS allows the PCC to ring steel plates with a little more authority than the G17 with the same ammo

[2017mini14]

Do you ever shoot steel closer than 100 yards with a PCC rifle? Maybe 50 yards, or is that to close?



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[sigstroker]

Are you a biologist of physics?

Damn skippy. My freshman physics professor got a presidential appointment to the Department of Energy, formerly known as the Atomic Energy Commission.

[walmart_ar15]

Depending on ammo, powder, etc. But information around the poker table is that 9mm NATO is optimized for sub gun at around 10 to 12" barrel. So it will still gain more velocity compared to a 5" barrel. Beyond 12" not much more velocity (powder burn) will be gained within the barrel to a point it will start to drag as longer the barrel gets. But how long, will it be 16", 18", 20" etc will be ammo depended.

But in general, a 16" PCC will always have higher velocity compared to a pistol at 5" or less. A better test would be compare a 16" barrel to say a 10" or 12" barrel.

[ysr_racer]

Damn skippy. My freshman physics professor got a presidential appointment to the Department of Energy, formerly known as the Atomic Energy Commission.

Cool, what's his Calguns username

[ysr_racer]

http://ballisticsbytheinch.com/9luger.html

So pretty much extra length always increases velocity. Nice