Subsonics - All Calibers

Apr 29, 2008
25
0
1
More results: Hornady 285hpbt with Trail Boss (19.0= 1100 fps, 17.0 =935 fps, 16.5 =890, 16.0=860 fps). 17.0 was the most accurate (.3) followed by 19.0 (.5).
 
Jun 20, 2011
108
0
16
35
Northern Kentucky/Cincinnati
300 blk 208 amax load

Here are my specs for reliable cycling:
Cmmg 8.0" barrel
H2 buffer, standard m16 bcg (Mobil1 synthetic 5w-30 for lube)
AAC SDN-6 can


208 amax lc cut down brass
CCI 400 primer
Hodgdon Lil Gun 8.2 gr
2.135 oal with med crimp

1050 +-25 fps

**NOTE the gas port on the factory cmmg barrel is .093. This is not sufficient to cycle with this can/load/powder. I enlarged gas port to .109 (7/64 bit in drill press) to get 100% reliable cycling, and it does not overpressure the 110 gr Barnes factory loads.

Use/modify at your own risk.
 
Jul 14, 2017
24
2
3
I see guys posting 150 RN over 9+ grains of trail boss going subsonic. I just loaded 7.9 grains and I am still supersonic. This is out of a 20" barrel, 1:12. Frustrated as all hell
Do you live at a higher elevation? That's a very relevant piece of information, and I don't see a lot of posters sharing that.
 

padom

SuperMod
Staff member
Mar 13, 2013
6,004
205
63
Southeastern, Pennsylvania
Here's my 9mm subsonic load. Its stupid quite, light recoiling and very accurate.

Glock 19
Suarez RMR Match Slide
Lothar Walther Match Threaded Barrel
RMR RM06
Rugged Obsidian 45 (45 endcap)

3.8g N340
Xtreme 165g Round Nose
Federal Brass
CCI 500 Primers
1.165" COAL
914fps

Loaded on a Dillon XL650 with mirror polished powder dispenser, Uniquetek Precision Powder baffle, Uniquetek Micrometer Powder Bar and Redding Micrometer seating die. I shot 30rds over my LabRadar which showed 914fps and an SD of 9.9. The most consistent pistol load Ive ever shot.

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25yds 5 Shot Groups [IMG2=JSON]{"data-align":"none","data-size":"full","height":"775","width":"590","src":"https:\/\/i.imgur.com\/NjZ0I4T.jpg"}[/IMG2]




25yds 10 Shot Groups [IMG2=JSON]{"data-align":"none","data-size":"full","height":"851","width":"542","src":"https:\/\/i.imgur.com\/nANReKW.jpg"}[/IMG2]




50yds 10 Shot Group [IMG2=JSON]{"data-align":"none","data-size":"full","height":"693","width":"551","src":"https:\/\/i.imgur.com\/eBaGlTp.jpg"}[/IMG2]





 
Last edited:
Jan 5, 2011
403
0
16
30
Charleston, WV
Rem 700 .308 16.5" AAC-SD 1:10" twist, TBAC 30P-1.
175 Nosler RDF, Lapua brass, CCI BR-2 primer.
No case alternations at all, FL re-sized with 0.001" shoulder bump.
9.5 grains Trailboss thrown from Chargemaster.
2.850" COAL, 0.210" jump to lands.
1055 fps, 34 ES, 13 SD via MagnetoSpeed.
0.8 MOA for 5 round groups out to 200 yards.
Nice round holes on poster board at 200 yards as well.
3.0 mils low from supersonic zero at 100 yards.
4.5 mils low at 200 yards from a 100 yard zero.