Finally recieved my suppressor
 

Shot a few rounds that I had worked up without the supp. velocity was 1025 fps using 220 SMK 10 grns AA 5744 and a Rem 7 1/2. Seemed kinda loud. Loaded 4 more and shot them over the chrono. Velocity had increased to 1107 fps with the supp. attached. At the temp. that day they were probably going supersonic. Kinda surprised that the velocity increased that much. I've reduced the load by a couple of tenths and will retry next days off weather permitting.

What is your rifle's barrel length and gas port position?

Rifle info
 

SSK upper & Suppressor
Barrel length - 16.25"
Adjustable gas port position - carbine

Congrats on the successful transfer of the suppressor!

Yup ... easy to get them just a little too fast. Makes quite a difference in the way they sound.

I was wrong about
 

the gas port position is 4 1/2" in front of reciever. My 223 gas port is 8 3/8" in front of reciever. Was going to try some more today but it was too windy.
I also have some 200 grn Sierra OMT and some Hornady 208 grn A-Maxes.

It has been my experience that 5744 is MUCH quieter than 1680 and a bit quieter than 2400.

Still waiting on the weather
 

Maybe next week. Loaded up 7 with 200 SMK and 9.7 grns H110. I shot 4 yesterday 2 with the gas system on Lo pressure setting and 2 with it turned off. Gas on there seemed to be some noise coming out of the action(not mechanicla). Sounded about like a 22 LR with the gas off.

More data
 

208 A-Max
8.6 grn V V N110
Rem 7 1/2
OAL 2.140"
1-1143 fps
2-1113
3-1114
4-1121
5-1120
Avg 1122
SD 12
group 1"hx 3/8"w

220 SMK
9.7 grn AA 5744
Rem 7 1/2
OAL 2.120"
1-1044
2-1017
3-1020
4-1029
5-1003
Avg 1022
SD 15
Group= 2"h x 3/8"w
1st shot 1 3/8" above 2,3,4 which were in a 3/8" x 3/8" with 5th 5/8" below 2,3,4


200 SMK
8.6 grn N110
Rem 7 1/2
OAL 2.110"
1-1120
2-1108
3-1114
4-1091
5-1084
Avg 1103
SD 15
Group= pattern

1st shot of every string had the highest velocity. This has been an occuring event with my 223 also. New electronic scale arriving today that weighs 2/100th grn.