lil gun load data

[gtiso]

I have been trying to work up a subsonic load using lil gun and 220gr smk
I am using a 16" barrel ar15 gas port in the carbine position in 85 deg weather
lake city brass winchester small rifle primer
8.5 gr 1306fps
7gr 1098fps
6.5gr 1067fps
6gr 1035fps
just curious how my results compare to anyone else's
6 gr of lil gun is not very much volume in the case
I am thinking about another powder
I have some 322 has anyone tried using this for a subsonic load

[Fritzcat]

I chronoed a rd today, Lil Gun 9.5gr and 220 Horn RN, seated at cannuluar and it went 1074fps out of a 10 1/2"with pistol gas block.

[gtiso]

looks like i am having some trouble with my powder charger
i am making up another batch and heading back out to the chrono tomorrow

[Colohunter]

Did any of these rounds cycle the action in your AR? I have used AA1680 for subsonics in my Whisper. I was able to get them to cycle and feed 150gr FMJs, but they did not lock the bolt back.

[dksd39]

cant speak about the load out of an AR- but my 220 SMK load is 8.5gr. Out of a 16" bolt rifle (actually 2) they are @1100 and shoot great.

[gary0529]

My load is 8.0 gr. Lil'Gun under a 240 gr SMK out of a bolt gun gives me right around 1035-1050 @ 50 degrees and has become my go to load.

Gary

[320pf]

Originally Posted by gtiso

I have been trying to work up a subsonic load using lil gun and 220gr smk
I am using a 16" barrel ar15 gas port in the carbine position in 85 deg weather
lake city brass winchester small rifle primer
8.5 gr 1306fps
7gr 1098fps
6.5gr 1067fps
6gr 1035fps
just curious how my results compare to anyone else's
6 gr of lil gun is not very much volume in the case
I am thinking about another powder
I have some 322 has anyone tried using this for a subsonic load

The speed of sound changes mostly with temp. and a bit with humidity. The pressure/elevation has very little impact on the speed of sound.

For the conditions that you list above (85 deg F) the speed of sound is about 1144 fps. So your 7gr load of LilGun is your best subsonic load. Your 7 gr load will be subsonic at temps down to about 48-50 deg F.

A good velocity to shoot for (pun intended) is about 1080 which is subsonic down to a temperature of about 30 deg F.

With a deep seated long 220gr SMK, 7gr of LilGun should pretty much fill the case. So it looks to me that you already have a good load if it hold a nice tight group.

I hope this helps.

320pf

[gtiso]

OK
after having some initial trouble with my powder dispenser I went to a rcbs chargemaster to ensure very accurate /consistent powder measure's
after a little more time at the range i have finally found a good load for my rifle
for whatever reason i couldnt get my gun to function well with any subsonic load using lilgun
i could get it to eject the case but not pick up another one or lock the bolt back on an empty mag
I tried a few loads with hodgen h322 and had very good success
my gun loves this powder it functioned well with all the loads i tried including locking the bolt back on an empty mag
13.6gr of h3222 220gr smk
3 shot average of 1029fps and a flawlessly functioning rifle