I'm looking for bullet/powder combinations for those of you who have loaded subsonic rounds for the Evo S3 with the 7 3/4" barrel.

I have a YHM R9 in AFT limbo (going to be mounted via 3 lug) and would like to load some quiet stuff for range use/giggle factor only.

I've done some research and it looks like 147gr RN and W231 is a decent starting point.

I'm open to any and all suggestions, thanks in advance!

A variation on the tried and true “Special K” load is probably what you are looking for.

Quoting Dr. Dater:

Almost all of the commercial 147 gr loads (white box, American Eagle, etc) are subsonic in a 5" barreled pistol. However, in the longer barrel of a subgun, they may not be. In an article I wrote for the old Machine Gun News in December 91, I chronographed a number of loads I worked up in both a Beretta M9 and an MP5.

I happen to like the VV N320 (3.6 gr) with a 147 gr pill. In the MP5 it runs in the 980 fps range. Interestingly, we had pressure measurements run on this load (since VV does NOT condone it), and the pressures are +P range (forget the exact numbers since is was about 12 years ago).

I also like (as a second choice), using WW-231 (around 3.9 gr) for similar MP5 velocities with the 147 gr pill. For bullets, I use the Hornady 3559 FMJ-RN 147 gr bullets. Truncated cone or JHP bullets often give serious feeding problems in the UZI and Ingram M10 type subguns.

As far as commercial 147 goes, your best bet is to buy a box and chronograph it in your weapon. The desired velocity is about 7% lower than the speed of sound (you get a lot of buffeting noise in the transsonic region). The speed of sound is temperature dependent (proportional to the square root of the absolute temperature -- only) and runs between around 1,050 at zero F to 1160 at 100 F.

The 158 gr IMI and Fiochi is subsonic in everything, but HK suggests against any bullet weight over 153 gr in the MP5.

Philip H. Dater

Currently I’m using 4 grains of HP-38 with 145 grain TMJ’s.  They’d cycle my MP5’s at 3.6 grains but I had to bump to 4 to get my Beretta with a non-boosted can to run reliably.

147 gr bullet and 3.0 gr Titegroup

The 165 gr xtreme and 2.6 gr Titegroup will be significantly quieter.

You’ll still get port pop with the scorpion. My MP5 clone and banshee upper are much quieter suppressor hosts  than my scorpion.

N320 with RMR 147gr round nose

W231 / HP-38 is a great place to start. Only downside is it can be very sooty, especially when shot suppressed

124gr RMR nuke JHP loaded to 1.08" oal with 4.1gr HP-38 gets me 1059 fps avg in a 16" Ruger PC Carbine and 1074 fps avg in a 5" 1911.

147gr RMR match winner fmj fp with 3.8gr HP-38 gets me 969 fps in a 16" Ruger PC Carbine and 991 fps avg in a 5" 1911

Thanks for all the replies so far! I’m taking notes..

2.9-3.0 of Titegroup is my go-to for 147's as well.

I'm going to start handloading subsonic 9mm as well, its too difficult/expensive to find round nose 147s so that they will feed properly in my AP5.

I ordered some Berry's plated 147 grain RN and VV N320. I'll let you know how it goes.