Subsonics - All Calibers

dhiza

Private
Belligerents
Apr 29, 2008
25
0
2
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).
 

Jimlaw83

Sergeant
Belligerents
Jun 20, 2011
105
0
18
36
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.
 

Ritterbruder

Private
Belligerents
Jul 14, 2017
24
3
6
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
6,818
1,318
219
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.

[IMG2=JSON]{"data-align":"none","data-size":"full","height":"968","width":"726","src":"https:\/\/i.imgur.com\/qmslMrU.jpg"}[/IMG2][IMG2=JSON]{"data-align":"none","data-size":"full","height":"548","width":"730","src":"https:\/\/i.imgur.com\/humDWo8.jpg"}[/IMG2]




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:

drglock

Yote slayer
Belligerents
Jan 13, 2012
600
114
49
Morrison,Oklahoma
.308
20” 1-10 twist
Lapua brass
190gr SMK’s
10.3gr Trail Boss
Sellier and Bellot LRP
1052 FPS
Sub .75 groups @ 100yds



Sent from my iPhone using Tapatalk
 

Brandon05_88

Sergeant
Belligerents
Jan 5, 2011
419
56
34
31
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.
 

GARFIO

Private
Minuteman
Jun 20, 2018
4
0
2
My .223 loads are:

Lapua case 1.750"
winchester small rifle primer
Hornadys 55 gn V-max With CANELLURE
Hodgdon Trail Boss 4.2 Gn
OAl. 2.250"

Rem700 5R tactical 1:9"
Sea Level
83 Farenheit
10 feet chrono speed

1. 1054 ft/s
2. 1045
3. 1059

1/2 MOA at 100 y

Using same of everything but
For Hornadys FMJ 55 gn
OAL 2.200"
Trail Boss 3.7 Gn

1.1078 ft/s
2.1069
3.1087
 
Last edited:

GARFIO

Private
Minuteman
Jun 20, 2018
4
0
2
My .308 Subsonic loads

Lapua case 2.005"
Hornady 220 GN Round Nose Interlock
Hodgdon Trail Boss 14.1 GN
CCI LARGE PRIMERS
OAL 2.735"

TIKKA T3 TACTICAL 24"1:11 TWIST
SEA LEVEL
83 FARENHEIT
SPEED CHRONO 10FT

1.1082 FT/S
2.1102
3.1098

1/4 MOA AT 100Y

HORNADYS 178 GN ELD-X
LAPUA CASE 2.005"
TRAIL BOSS 10.1 GN
OAL 2.800"

1.1070 FT/S
2.1062
3.1059
 

kindabitey

Grumpy OB
Hessian
Online Training Access
Belligerents
Feb 13, 2017
161
168
49
Bassett, VA
I tried it with some Hornady 150 fmj (3037). It was only around 25% case fill, which made me a little nervous. I can't recommend it for 308. Trail Boss
or N32C (Tin Star) will be your best options.
 

joel65

Private
Belligerents
Jul 29, 2017
150
51
34
Deridder, Louisiana
.308 1:12 twist
Sierra 150 gn rn pro-hunter
9.8 Trailboss
CCI200
Random brass trimmed at 2.005
The 150 rn has a flat base that helps with the 1:12 twist. Did not keyhole, and works great suppressed.
 

combatgrunt84

Sergeant of the Hide
Belligerents
Jan 28, 2018
135
20
22
35
Pasadena, MD
Getting ready to load my first subs. My can come in 45 days does the below look okay?

DPMS Recon GII
16in Barrel
178grn Amax
Trail Boss start at 9.0 work up to 10.4
2.800 COAL

So I test with no can for speed and to make sure they are not tumbling correct?
 

joel65

Private
Belligerents
Jul 29, 2017
150
51
34
Deridder, Louisiana
1:10 twist do I need to still flasholes out?
I’ve never had to open up or use a flash hole deburring tool. Shoot your paper at distance to see when it will keyhole. The more you shoot the better (50-100). If you don’t get perfect circles, you may need to increase velocity or choose another bullet.
 

towerofpower93

Private
Belligerents
Jul 11, 2010
184
46
34
35
Getting ready to load my first subs. My can come in 45 days does the below look okay?

DPMS Recon GII
16in Barrel
178grn Amax
Trail Boss start at 9.0 work up to 10.4
2.800 COAL

So I test with no can for speed and to make sure they are not tumbling correct?
You didn't mention it, so I'll jump in for good measure.

After working down to your desired velocity with a chrono and the suppressor OFF the rifle, set up a paper target 5yds downrange and put a few rounds into it, spacing them apart a few inches. Look for any out of round holes before attaching the can.

Keyholing at distance will be bad for accuracy. Keyholing at the muzzle is bad for accuracy and your suppressor.

I've done this for every subsonic load I've worked up in a number of different calibers and rifles and have had no issues with baffle strikes.
 
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combatgrunt84

Sergeant of the Hide
Belligerents
Jan 28, 2018
135
20
22
35
Pasadena, MD
The First String was only 5rnds I was unable to get setup in time. I also was unable to reset between strings to the get the SD and ES numbers as well. This is without Suppressor, no keyholing at 100yards the 10.6 and 10.3 grouped the best all within 1.5inches for me.

Gun: DPMS GII Recon 16inch Factory Barrel
Hornady Brass TTL. 2.005
Flash Hole Resized
Pockets Uniformed
FL Resized and Neck Resized to: .332
COAL 2.790
178grn Hornady ELX Match
CCI Large Rifle Primer
Measure 10ft From Barrel to Chrono

Temp: 83
1022.5 Baro Pressure
27.4 Wet Bulb
26.9 DP
88.5 Rel Humidity
-245 flt Altittude
10.6grain Trail Boss

1077
1028
1059
1034
1071
Avg Velocity: 1053

10.3grn Trail Boss
1077
1025
1059
1034
1071
Avg: 1053

1052
1049
1068
1055
1054
Avg: 1055

10.0grain Trail Boss
1025
1026
1040
993
1017
Avg: 1020

1012
1012
1028
1014
1028
Avg: 1018

9.7grains Trail Boss
983
990
998
981
992
Avg: 988

991
996
978
986
1007
Avg: 991
 

winniedonkey

Sergeant of the Hide
Belligerents
Feb 13, 2017
349
83
34
Orlando
The First String was only 5rnds I was unable to get setup in time. I also was unable to reset between strings to the get the SD and ES numbers as well. This is without Suppressor, no keyholing at 100yards the 10.6 and 10.3 grouped the best all within 1.5inches for me.

Gun: DPMS GII Recon 16inch Factory Barrel
Hornady Brass TTL. 2.005
Flash Hole Resized
Pockets Uniformed
FL Resized and Neck Resized to: .332
COAL 2.790
178grn Hornady ELX Match
CCI Large Rifle Primer
Measure 10ft From Barrel to Chrono

Temp: 83
1022.5 Baro Pressure
27.4 Wet Bulb
26.9 DP
88.5 Rel Humidity
-245 flt Altittude
10.6grain Trail Boss

1077
1028
1059
1034
1071
Avg Velocity: 1053

10.3grn Trail Boss
1077
1025
1059
1034
1071
Avg: 1053

1052
1049
1068
1055
1054
Avg: 1055

10.0grain Trail Boss
1025
1026
1040
993
1017
Avg: 1020

1012
1012
1028
1014
1028
Avg: 1018

9.7grains Trail Boss
983
990
998
981
992
Avg: 988

991
996
978
986
1007
Avg: 991
Thanks for doing the leg work for me. Have same rifle.
 

cruze5

Gunny Sergeant
Belligerents
Nov 11, 2006
511
7
22
Kentucky, Lexington
this thread is awesome but a mess!

i just started loading for my FN SPR with 1/10 twist 24 bbl. 308. using my ultra 7 30cal (no i did not shoot them with the can on it initially)

i started from the only manual i saw from hodgedon. i used 155 palma bullets and 12 grains of trailboss then 11 grains.

12 was going 1436 AV
11 was 1357 AV

i have a ton of 190's to try. i think i'll start with 11 grains and then try 10.
 

Dirty8404

Sergeant of the Hide
Belligerents
Minuteman
Apr 17, 2018
199
146
49
this thread is awesome but a mess!

i just started loading for my FN SPR with 1/10 twist 24 bbl. 308. using my ultra 7 30cal (no i did not shoot them with the can on it initially)

i started from the only manual i saw from hodgedon. i used 155 palma bullets and 12 grains of trailboss then 11 grains.

12 was going 1436 AV
11 was 1357 AV

i have a ton of 190's to try. i think i'll start with 11 grains and then try 10.
I’d go right to 10.0 with the 190s personally, but I’ll bet you end up around 9.5gr. With a 20” barrel 10.0gr was a bit fast still, so I went to 9.5gr. Same barrel at 16” gives me around 1050fps with moly’d 170gr FP and 10.0gr.
 

cruze5

Gunny Sergeant
Belligerents
Nov 11, 2006
511
7
22
Kentucky, Lexington
same rifle no can:
10 grains with a 190SMK= 1102

9.5 grains 190 SMK= 1043.

next trip i'll have to load 9.5 again and verify with the ultra 7 on