I’m looking for data using a 147 gr fmjbt using lil-Gun powder for a subsonic load.

I’ve loaded them only supersonic with 15gr of Lil-Gun.

Any information is appreciated.

I’m using a CMMG 8.5” barrel with a 1-7 twist. Thanks ahead.

It may help if you mentioned the caliber this was for.  I reload 9mm and 147gr bullets are common in that caliber.  However 15gr of any powder would be....well not good; provided you could squish it in to a 9mm case..which I doubt

I'm gonna guess 300blk

If your asking about the 147gr feed ok in my 300 Blackout...yes it did. It cycled very hard though.

I need to start another topic and ask what should I expect from the build I have.

I loaded 15gr and 16gr lilgun powder at 2.100 using CCI small rifle magnum primer. With 8.5” CMMG 1 in 7 twist.

At 50 yrds.... the 16gr shot better. But better isn’t good enough. I’m talking about maybe a 18” group...

I’m just starting reloading so I was told that I need to use a heavier bullet since I have a 1/7 twist. So I’m gonna try loading some Sierra 220 MK.

I’m having a hard time find specific load data for the subsonic SMK 220 using Lilgun powder. Only thing I’ve found was here on AR15’s site and it was .... SMK 220gr , Lilgun 9gr , 2.260”

So I’m gonna try that . Any ideas or past successful experiences loads are greatly appreciated. Thanks as always.

You're not gonna get 147's to run subsonic and cycle, unless gun is modified heavily to run subs only.

I've gotten 180's to cycle, but they are much louder.


A good 147 super load should run about 2-4moa easily.

You're most likely gonna be overgassed with supers, the reason it "cycled hard".

Start over and work up in .2 grain increments from 15-16grains(5 each) and put them on paper. I've always seated them to mid cannelure with mild crimp from Lee FCD.

If your new, read your manual front to back, use published data and slow down and pay attention.

This

Get bullets above 200gr and it will be alot easier.  147s shoot decently as supers, generally right around 2" for a 5 shot group at 100 yards.