CamPro 124gr + CZ Shadow barrel - OAL and sanity check

I too use Campro 124 at 1.11 but with 3.8gr of Titegroup for my Shadow. Works like a charm. I would recommend loading on the shorter end rather than at max OAL to alleviate any feeding issues.
 
I tried to remember my university course of physic and calculate the pressure in the cartridge if I reduce OAL. So, in ideal condition every 0.01" (from my current 1.140") can increase the pressure approx by 1%. The SAAMI pressure for 9mm is around 35,000 PSI, and C.I.P rates 9mm at 34,080 PSI. So I should not go over this limit. Let's assume published data for 124gr and 4.1gr of N320 is not going over 32,000 PSI, so in this case if we reduce OAL from published 1.142" to 1.110", the pressure should not going over 33,000 PSI. Another scenario if we reduce OAL by 0.15" - in this case we should expect the pressure over 37,000 PSI.

So, next 3 series I am going to try OAL 1.11" with 3.8gr, 3.9gr and 4.0gr of N320. I will publish data from chrono closed to weekend. Also I am going to make a few rounds with Winchester cases (right now test shows the volume of Federal is a little bit smaller than Remington case).
 
I use 1.160 for 124gr campro and 1.140 for 147 gr campro in a CZ shadowline. Chambers perfectly, no issues.
The only other issue I could see is if your mag lips are bent or something, so it chambers at a different angle causing feeding issues.

Longer OAL equals less resistance with brass to bullet, which means faster fps. The shorter you load your bullets, the slower it goes. (yes, also depends on how strong your taper crimp is too)
 
SoylentD said:
I use 1.160 for 124gr campro and 1.140 for 147 gr campro in a CZ shadowline. Chambers perfectly, no issues.
The only other issue I could see is if your mag lips are bent or something, so it chambers at a different angle causing feeding issues.

Longer OAL equals less resistance with brass to bullet, which means faster fps. The shorter you load your bullets, the slower it goes. (yes, also depends on how strong your taper crimp is too)
Click to expand...

Not so sure about this lol.
 
SoylentD said:
I use 1.160 for 124gr campro and 1.140 for 147 gr campro in a CZ shadowline. Chambers perfectly, no issues.
The only other issue I could see is if your mag lips are bent or something, so it chambers at a different angle causing feeding issues.

Longer OAL equals less resistance with brass to bullet, which means faster fps. The shorter you load your bullets, the slower it goes. (yes, also depends on how strong your taper crimp is too)
Click to expand...

SunShine? Is that you?

Got it backwards. Deeper will increase velocity/pressure.
 
I have reduced OAL to 1.113" and had a chance to verify my calculation in post #22.

CamPro 124gr FCP-RN, 3.8 gr n320, OAL 1.113", CCI primer, Remington (R-P) case
Series, 1, Shots:, 6
Min, 963, Max,1018
Avg 990, S-D 21.8, ES 55

Shot,Speed
1, 963, ft/s
2, 991, ft/s
3, 985, ft/s
4, 971, ft/s
5, 1012, ft/s
6, 1018, ft/s
----,----,----


CamPro 124gr FCP-RN, 3.9 gr n320, OAL 1.113", CCI primer, Remington (R-P) case
Shots: 7
Min 992, Max 1006
Avg 998, S-D 6.0, ES 14

Shot,Speed
1, 995, ft/s
2, 1004, ft/s
3, 993, ft/s
4, 992, ft/s
5, 1006, ft/s
6, 994, ft/s
7, 1004, ft/s
----,----,----


CamPro 124gr FCP-RN, 4.0 gr n320, OAL 1.113", CCI primer, Remington (R-P) case
Shots:, 7
Min 1005, Max 1024
Avg 1017, S-D 7.0, ES 19

Shot,Speed
1, 1005, ft/s
2, 1018, ft/s
3, 1023, ft/s
4, 1022, ft/s
5, 1011, ft/s
6, 1024, ft/s
7, 1020, ft/s
----,----,----

First two series were not so accurate.

Also I have tested with Federal and Winchester cases.

CamPro 124gr FCP-RN, 3.9 gr n320, OAL 1.113", CCI primer, Federal (F-C) case
Shots: 6
Min 1005, Max 1041
Avg 1016, S-D 13.4, ES 36

Shot,Speed
1, 1010, ft/s
2, 1041, ft/s
3, 1015, ft/s
4, 1021, ft/s
5, 1005, ft/s
6, 1006, ft/s
----,----,----

CamPro 124gr FCP-RN, 4.0 gr n320, OAL 1.140", CCI primer, Winchester (WIN) case
Shots:, 5
Min 981, Max 1010
Avg 1000, S-D,11.6, ES 29

Shot,Speed
1, 981, ft/s
2, 1010, ft/s
3, 1007, ft/s
4, 1006, ft/s
5, 1000, ft/s
----,----,----

So... still no PF :(

Next step will be 4.1gr of N320 @ 1.113".
 
You have power factor- just not enough :)
Humidity, temperature and altitude all effect velocity so if you need PF for some sport (IPSC?) remember to build in enough power factor to accommodate changing weather at multiple ranges.
 
wasrupzuk said:
Humidity, temperature and altitude all effect velocity so if you need PF for some sport (IPSC?) remember to build in enough power factor to accommodate changing weather at multiple ranges.
Click to expand...
Yes, for IPSC :)
I would like to reach PF ~130, currently I can see only PF 125. So I need almost 32 ft/s to reach required PF.
I am expecting to get another 20ft/s from 0.1gr of powder (4.1gr of N320) to reach PF 128, but 4.1gr is max recommended amount by VV.
 
I did next iteration today.

CamPro 124gr FCP-RN, 4.1 gr n320, OAL 1.113", CCI primer, Remington (R-P) case
Shots: 7
Min 1021, Max 1059, Avg 1043, S-D 12.6, ES 38

Shot,Speed
1, 1035 ft/s
2, 1048 ft/s
3, 1053 ft/s
4, 1021 ft/s
5, 1042 ft/s
6, 1059 ft/s
7, 1048 ft/s
----,----


CamPro 124gr FCP-RN, 4.13 gr n320, OAL 1.113", CCI primer, Remington (R-P) case
Shots:, 7
Min 1040, Max 1067, Avg 1052, S-D 10.4, ES 27

Shot,Speed
1, 1040 ft/s
2, 1067 ft/s
3, 1052 ft/s
4, 1052 ft/s
5, 1047 ft/s
6, 1066 ft/s
7, 1044 ft/s
----,----

So... 4.13gr of N320 gives me 130 PF :)

Also I chroned a few round of factory ammo.

American Eagle AE9AP 124gr FMJ, marked as 1150 ft/s ammo.
Shots: 7
Min 1056, Max 1083, Avg 1069, S-D 9.6, ES 27

Shot,Speed
1, 1068 ft/s
2, 1073 ft/s
3, 1083 ft/s
4, 1067 ft/s
5, 1079 ft/s
6, 1060 ft/s
7, 1056 ft/s
----,----

I expected to see numbers close to advertised 1150ft/s, but average is more than 80ft/s less of this.
The weather info: 20C, R.h. 70%, atm. 29.79 inHg

Thanks everybody for your help!

P.S.: Also more than 4.4gr of N320 @1.113" with CamPro 124 FCP-RN will be compressed.
 
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My CZ SP 75-01 Shadow likes a shorter OAL, I run 4.2 grn TG with a 1.10 OAL. I know that a bit less powder could be used and still cycle reliably.
 
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