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

[hermosabeach]

Brad
Thanks for posting the data. 100 fps is a game changer

[ysr_racer]

.

The nonsense is the 99.9999% number you pulled out of who knows where. You made it up.

.

87% of all internet statistics are made up.

[sigstroker]

The nonsense is the 99.9999% number you pulled out of who knows where. You made it up.

Did you just say ysr posts nonsense??!?

Say it ain't so!

[crufflers]

I love a good game changer thread.

[ysr_racer]

Did you just say ysr posts nonsense??!?

Say it ain't so!

Up next, water is wet.

[Scotty]

So pretty much extra length always increases velocity. Nice

Sort of. My load is 3.4 gr. of Titegroup behind a 147 gr. plated bullet. It's a 140 pf load. My 1911 likes it. The calculated velocity and the actual velocity are very close at 944 fps out of a 5 in barrel. It peaks at 33 ksi at .6 inches in the barrel and drops to 2 ksi by 5 in. With a 16 in. barrel, velocity goes up by 130 fps but the pressure at 16 in. is down to 500 psi. The calculated pressure at 20 in. is down to 380 psi. At some point the friction from the barrel will be greater than the remaining pressure. This is how people stack bullets in the barrel. My coworker stacked 2 bullets at the muzzle. JP had someone stack like 20 bullets.

Do any of you guys run coated bullets like Blue or Bayou in your PCC?

Or just plated?

Or just jacketed?

I shot SNS coated bullets for a few months, then after submerging my muzzle brake in every solvent I had including Kroil, still had to chisel out the lead build up. My muzzle brake almost had no ports. I stick with plated bullets now.

[pratchett]

Great data, OP. Question: I heard someone say that there is "no useful difference" in ballistics (terminal or otherwise) between a full-size 9mm handgun and a 9mm PCC.* Would you say your data supports that view, or are you seeing things in the weeds I am not picking up?

*Before anyone loses their mind, yes - there are other useful things a PCC brings to the fight. But I'm simply talking about ballistics here.

[crufflers]

Some people think +160 fps is useful, hahahahahahahahahahah.

[ysr_racer]

Yeah, 4.1/4.2 behind a 124gr round nose is my standard USPSA load. Soft shooting, feeds well.

I'm not charging loads for my pcc. I don't need any velocity over 130 power factor.

[pratchett]

Some people think +160 fps is useful, hahahahahahahahahahah.

Do you? I'm not convinced but I'm here to learn.

[crufflers]

Do you? I'm not convinced but I'm here to learn.

I do. I know a pistol caliber out of a carbine is much more accurate to shoot at 100 yards for me at speed with irons or with a red dot... and the fact that I get the extra velocity from a 16" barrel compared to something like a G19... means the bullet has enough zip on it to perform better out there at 100 yards.

You get into calibers like .357 mag and .44 mag... you will see some performance and destruction approaching rifle rounds IMHO. YEAH the barrel matters.

I'm sure if you load up some BB 115 grain +P+ it is going to matter even more.

Around +15% is what I mathed for a few common loads from BBTI... and that is enough to make a difference IMHO.

[crufflers]

Up next, water is wet.

QFT

[ysr_racer]

Name: 9mm: 124gr Zero RN: Win 231 4.1gr: Mix Case: OAL 1.125 PCC
Notes: CMMG RDB Radial PCC 16"
Shots: 5
Average: 1100 ft/s
SD: 14 ft/s
Min: 1082 ft/s
Max: 1119 ft/s
Spread: 37 ft/s
Power Factor Average: 136
Power Factor Low: 134
Power Factor High: 138
Barometric Pressure: 30 in Hg
Temperature: 78 F
Weight: 124.0 gr.
Powder/Wt: Win 231 / 4.1
Bullet/Wt: Zero / 124
Primer: CCI SPP
OAL: 1.125
Gun: CMMG RDB Radial PCC 16"

[ysr_racer]

Name: 9mm: 124gr Hoosier RN: Win 231 4.1gr: Mix Case: OAL 1.090 PCC
Notes: CMMG RDB Radial PCC 16"
Shots: 3
Average: 1167 ft/s
SD: 7 ft/s
Min: 1159 ft/s
Max: 1177 ft/s
Spread: 18 ft/s
Power Factor Average: 144
Power Factor Low: 143
Power Factor High: 145
Barometric Pressure: 30 in Hg
Temperature: 78 F
Weight: 124.0 gr.
Powder/Wt: Win 231 / 4.1
Bullet/Wt: Hoosier / 124
Primer: CCI SPP
OAL: 1.090
Gun: CMMG RDB Radial PCC 16"