9mm for suppressed pcc

[sphingta]

Does any one have any experience with making subsonic 147 xtp loads for a 16” barrel. I tried 4.2, 4.4 and 4.6 grains of true blue. Loaded to 1.1” oal. The 4.6 load was the only one that was consistent. I thought it was a clean powder but brass is fairly dirty after being shot. Almost like there is not enough pressure to expand brass and seal. The 2 lighter loads were very inconsistent with 100 fps spreads. The 4.6 load dropped down to a sd of 16 at 1070 fps. Do you think it would be better with a faster powder that normally wouldn’t be first choice with 147’s. I have 231 and 244, and a couple others. Looking for consistent subsonic, not speed or power. Power pistol seems like it would do the same as true blue. Any thoughts or experiences I would appreciate.

 

[unodemo]

147gn Berry's, 3.7gn CFE Pistol, seated to 1.16" works in my 16" PCC. 948,960,978,974,963,968,965,982,943,963. 964fps @ 10', 11.6 SD, 39 ES

For reference, the same load in a Performance Center Shield goes 815fps and 4.0gn CFE-P in a 5" RIA 1911 goes 905fps. SD and ES stayed consistent in both platforms.

147gn bullets and CFE Pistol go together.

 

[BlytheIronwood]

147gn Berry's, 3.7gn CFE Pistol, seated to 1.16" works in my 16" PCC. 948,960,978,974,963,968,965,982,943,963. 964fps @ 10', 11.6 SD, 39 ES

For reference, the same load in a Performance Center Shield goes 815fps and 4.0gn CFE-P in a 5" RIA 1911 goes 905fps. SD and ES stayed consistent in both platforms.

147gn bullets and CFE Pistol go together.


Suppressed PCC topics always bring out strong opinions, but this thread stays informative and experience-based. It’s helpful seeing real feedback instead of theory alone. I usually read technical discussions like this while also organizing study time for things such as edutest, since both require attention to detail.

Thank you, you made my weekend.

Edit: Ok, thank you for replying, I will keep it in mind.

 

[unodemo]

I also recall loading with 3.2gn N320. My tuned 5" M&P liked it. 855,844,863,865,839. 855fps @ 10', 10.2 SD, 26 ES.

QuickLOAD indicates 3.2gn N320 will send a 147gn Berry's ~1050 out of a 16" PCC.

I got to the chronograph. 147gn Berrys and 3.2gn N320 sent it 925fps from the 16" PCC. 911,916,914,930,937,935,932,925. 925fps @ 10', 9.5 SD, 26 ES.
It looks like 147gn bullets and N320 got together as well.

2026-01-24 update:
147gn Berry's. 3.4gn N320 (max. charge) seated to 1.160" COL. 16" PCC. 1005fps, 15.2 SD, 52 ES, 148 Pf
147gn Berry's, 4.0gn CFE Pistol (4.3gn max. charge), seated to 1.160" COL. 16" PCC. 1058,1060,1088,1083,1066,1082,1084,1087,1079,1084. 1077fps, 10.8 SD, 30 ES, 158 Pf

N320 struggled to make enough power to reliably operate the blowback recoil system, and finally ran out of gas.
The CFE-P load hit its stride and isn't looking back.