Load Catalog: Subsonic, A1680, 150gr to 200gr

[bamachem]

The "Standard" Powders are currently Lil'Gun, H110, and A1680. This thread is for any Subsonic loads using powders OTHER than these.

This thread is a compilation of "Pet Loads" that others have contributed for publication. No chat and no discussion of loads. You can provide a link in your post for the "workup" of the load if you choose to post one.

Any loads listed are what have worked for others, but does not mean that they will work for you or your specific firearm. Pet Loads are NOT a shortcut nor a quick and cheap way to escape the sometimes tedious task of load development. Load development means starting with a LOWER powder charge and working up to that "Pet Load" in a safe and methodical manner, always checking for signs of overpressure along the way. NEVER take a "Pet Load" and use it as a starting point.

In order to be considered for publication, you can submit your information in the following format:

Rifle Used
Barrel Maker, Contour, Gas Length/Port Size (if known)
Barrel Length and Twist
Magazine Brand/Size
Bullet Used (grain, manufacturer, type)
Powder Charge and Brand
Case Used
Primer Used
COAL
Chronograph Velocity, if known or manual velocity, if known.
Any issues or problems, Failure to Fire, Failure to Feed, Failure to Eject, etc. Keep it short.
Link to your "workup" thread

This is an example of a load that I worked up in my AR:
AR15
AR Stoner, Med Contour, Carbine
16", 1:8 5R
MagPul PMAG, 30RD & Custom 10RD (cut down 30RD mag)
110 gr Hornady V-Max
19.6gr Hodgdon Lil'Gun
LC 5.56, reformed to 300BLK
CCI 450 Small Mag
2.10"
2350 FPS (estimated, manual)
Zero Issues so far. All feed, fire, and eject fine.
N/A

Please ensure that your load info is in this format when submitted. Any loads that are incomplete are subject to deletion at any time.

Again, no chat or discussion allowed. Chat and discussion should be done in your individual "workup" thread that you link to.

Thanks!

[bamachem]

Originally posted by gds:

AR15
Custom barrel from remington 700 cut down rechambered and profiled, 16 inch 1 in 10 twist carbine gas with .125 hole
20 round Pmag
Hornady 178gr AMAX
10.1gr A1680
LC cut down brass
Winchester SR
2.195 COAL
935fps

3/4 inch grouping at 50yds


Keyword Catalog Code: LC-1680-178-SB

[bamachem]

Originally posted by gds:

AR15
Custom barrel from remington 700 cut down rechambered and profiled, 16 inch 1 in 10 twist carbine gas with .125 hole
20 round Pmag
Lee 200gr round nose cast from Wheel weights
10.1gr A1680
LC cut down brass
Winchester SR
1.990 COAL
1025fps

1.25 inch grouping at 50 yds


Keyword Catalog Code: LC-1680-200-SB

[trey_phish83]

does anyone have any other bullet weights in this subsonic 1680 file?

i've worked my ar pretty well now, the other night i was shooting 150's subsonic with lil gun, but now i wanna see what i can do with some 1680

[tallburnedmidget]

AR15
AAC upper, Med Contour, Carbine Gas, RRA Lower (AR0901CX) no mods
16", 1:7 twist
Lancer L5 20rnd mag
150 gr Barnes MPG
Various gr of A1680 see below
Mixed brass, reformed to 300BLK, annealed and 1/2 turn crimp
Remington 7 1/2 Small Rifle Primers
COAL: 2.005"
See FPS below from Magneto Speed Chronograph
All loads Cycled with no issue UNSUPRESSED, see each load on Bolt Hold Open upon last shot
Temp 95 degrees and 533 ft above sea level
Thread: viewtopic.php?f=145&t=83976


A1680 11.1gr
1108
1068
1096
1128
1132
Avg 1106, Bolt Held Open, most accurate at 25yds w/out trying, making 1 big hole measuring just over 0.5 inches

A1680 11.0gr
1042
1070
1041
1053
1055
Avg 1052, Bolt Held Open

A1680 10.8gr
1085
1051
1043
1062
1044
Avg 1057, NO Bolt Held Open

A1680 10.6gr
1037
1020
1043
1006
980
Avg 1012, NO Bolt Held Open

[tallburnedmidget]

Disclaimer: I was loading the 200gr Lehigh ME then they switched to the 194gr design and I kept the same load, it shot even more accurately and I figured the 6gr weight decrease was negligible enough to not worry about the speed increase. The following is my load for both but was chrony'ed on the 200gr bullet.

AR15
AAC upper, Med Contour, Carbine Gas, RRA Lower (AR0901CX) no mods
16", 1:7 twist
Lancer L5 20rnd mag
194/200 gr Lehigh Defense Maximum Expansion (ME)
10.0 gr of A1680
Mixed brass, reformed to 300BLK, annealed and 1/2 turn crimp
Remington 7 1/2 Small Rifle Primers
COAL: 2.120"
Mx: 1056 fps
Mn: 963 fps (next lowest was 988 fps, a bit of an ES going on here)
Avg: 1015 fps

Cycled with no issue UNSUPRESSED and Bolt Hold Open upon last shot
Temp 65 degrees and 533 ft above sea level

[Recoil737]

194gr Lehigh defense Subsonic handloads.

AR-15
Noveske 8.2" with 1:8 twist with an AAC SDN-6 Suppressor (attached during all testing).
Lancer 30rd
Lehigh Defense 194gr Maximum Expansion bullet
A1680 11.1gr
AAC Brass with primers already inserted
COAL was 2.220

I tested 3 different loads:

11.1gr A1680
Min 932 fps
Max 951 fps
SD 7
avg 941 fps

10.8gr A1680
Min 920 fps
Max 928 fps
SD 3
avg 925 fps

10.6gr A1680
Lower than the other two

On the 10.6 load on the last bullet there was a failure to feed. I took the round out and put it back in the mag. I charged the weapon and it went in and fired normally.

All Loads cycled and held the bolt open on the last round.

I shot at 15 yards and they were hole in hole.

Temp 66 degrees and 487 ft above sea level

[Khackee]

I'm new to the forum & the 300 Blk, Im not new to the AR platform & reloading. It's great to see everyone sharing their data in a forum that I dont have to pay for. Thank You

[aggiephil30]

AR-15
AAC 8" with 1:8 twist with an Houston Armory integral Suppressor.
Pmag 10 round
Hornady 208 Gr A-Max
A1680 powder
300 Whisper brass
Rem 7 1/2 primers
COAL was 2.218
All loads locked bolt back

11.2 Gr
1005
992
970

11.3 Gr
1034
1021
1002
1048

11.4 Gr
1025
1058
1014
1034

11.5 Gr
1021
1019
No reading
1040

11.6 Gr
1051
1060
1045
1078

15.0 Gr
1205
1235
1234

[certifiable]

Updated 9" & 16"AR w/ Pistol Gas:
viewtopic.php?f=141&t=96399