Why Lil gun has no place in 300BLK subsonics...

[Rancid Coolaid]

And 1680 recipes I should be trying instead?

I agree H110 shouldn't be used in sub, why not Lil gun?

[L1A1Rocker]

Why shouldn't H110 not be used in subsonic? I've read great things about it.

[Rancid Coolaid]

My experience (and the experiences of a few who advised me): it is very sensitive to position in the case and to temperature.

I played with it for several months and had extreme vertical stringing. A few recommended I move to something else, problem went away entirely.

Anecdotal: yes, but I don't run H110 in subs any longer.

[Titleiiredneck]

H110 is decent in a bolt gun, I pefer aa#9.

[rsilvers]

H110 and Lil'Gun are both bad in subs for 300 AAC BLACKOUT ARs because they don't generate enough gas pressure, so there is a wider gap between subsonic and supersonic cyclic rate and so one gas port cannot handle both as well as if the subsonic powder made more gas.

If you use A1680, then it makes enough gas to cycle close enough to the same rate as supersonic ammo.

H110 should be ok in subs for bolt guns. I have seen people say it was temp sensitive, but I have not heard of this being shown in a lab test. I do know that Lil-Gun is a high nitro pistol powder and has elevated pressures at certain temps that are significant enough that one may not want to load it to max pressure at standard temps.

[Rancid Coolaid]

For clarification, my 300 is only run subsonic. I had bad experiences with H110 but very good experiences with lil gun.

No supersonic rounds will be fired.


Important clarification.

[Rancid Coolaid]

Any recommendations for a carbine gas system, 208-gr Amax using 1680?

[rsilvers]

You can use Lil'Gun if you dedicate the gun to it. Basically you load the ammo until you get 1000 fps, pick a buffer - perhaps a standard carbine buffer. Then see if it locks open on an empty mag. If it does, you can call that good enough, or you can do cyclic rate testing with a FA lower and make sure you are at least at 700 rpm. If not, you can open the gas port. But then you probably don't want to shoot normal ammo in the same gun - though you may be ok if you then change to an H3 buffer.

[hugginsvilleH&A]

from my other post: Ok for an update for anyone interested in the outlaw bullets, this is the recipe that I worked up for the 240 outlaw I used 11.2 gr of 1680 with OAL at 2.130 it came in at 1060fps which is what I was looking for, everything cycled/worked as advertised. For the 210 Outlaw I used 11.0 gr of 1680 with OAL of 2.100 it came in at 1098fps and everything cyled/worked as advertised, FYI my setup is a model 1 sales upper over a R/R lower I modified the ramps and use a modified magpull magazine and the outlaws cycled thru it with no problems, now I'm ready for the little piggys and. Deer season is right around the corner!

[Ned christiansen]

The last thing I want to do here is dilute the knowledge base, but-- any experience or comments on using DuPont SR 4759 in this caliber? I only ask because-- you guessed it-- I have some that does not seem to fit anywhere else.

What research I've done would seem to indicate it ought to be good, but I kinda wish somebody else would try it first