.308 Subsonic Load

gibby · Feb 5, 2011

Looking for a good subsonic recipe for a .308 suppressor.

Any Ideas

pop-gunner · Feb 5, 2011

Lots of folks using Trailboss powder popular with cowboy action shooters for quiet .308.
You may need to open up the flash holes on your brass to get a better burn.
If you do open any flash holes be sure and mark that brass well as you can NEVER use that brass for standard rifle pressure rounds again.
There is a bunch of info out there for quiet .30cal due to the popularity of the 300 Whisper.
I would suggest reading everything you can get your hands on twice.

Rockzilla · Feb 5, 2011

try looking here:

http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2280009
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2202129

This thread for All Calibers Subsonics on various platforms:
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=468230

As pop-gunner mentioned most are opening up the flash holes.

-Rock

rsideout · Feb 7, 2011

I don't reload, but here is some SubSonic .308 ammo that I bought on GunBroker. It is VERY quiet.

pop-gunner · Feb 7, 2011

rsideout said:
I don't reload, but here is some SubSonic .308 ammo that I bought on GunBroker. It is VERY quiet.

Nice of them to put the recipe on the box for you...

BenL · Feb 7, 2011

rsideout said:
I don't reload, but here is some SubSonic .308 ammo that I bought on GunBroker. It is VERY quiet.

What twist is your barrel? Are they coming out straight?

I was thinking of getting some trailboss and working up a subsonic load for the Hornady 208 gr. .30, but wasn't sure how they'd fly in my 1:10 .308.

rsideout · Feb 7, 2011

BenL said:
What twist is your barrel? Are they coming out straight?

I was thinking of getting some trailboss and working up a subsonic load for the Hornady 208 gr. .30, but wasn't sure how they'd fly in my 1:10 .308.

I shot a few of the subsonics this weekend out of my Savage BAS-K. It has a 24" barrel with a 1:10 twist. They are definately no where near as accurate as full power loads. This was my first time shooting this gun. The best were a few 3/4" & 7/8" 5 shot groups at 100 yds with 168gr Hornady Match & 168 gr Federal GM. For comparision, a 3 shot group of the 200gr Subsonics were about a 2 to 2.5" group. To me, these are really just fun rounds for playing with the silencer. The silencer is an SWR Omega 300.

BenL · Feb 7, 2011

rsideout said:
I shot a few of the subsonics this weekend out of my Savage BAS-K. It has a 24" barrel with a 1:10 twist. They are definately no where near as accurate as full power loads. This was my first time shooting this gun. The best were a few 3/4" & 7/8" 5 shot groups at 100 yds with 168gr Hornady Match & 168 gr Federal GM. For comparision, a 3 shot group of the 200gr Subsonics were about a 2 to 2.5" group. To me, these are really just fun rounds for playing with the silencer. The silencer is an SWR Omega 300.

Exact same barrel, and exactly what I wanted to know.

rsideout · Feb 7, 2011

BenL, after getting home and looking at the target, here is a little more info for you. The subsonic 3 shot group actually measured 1-7/8". Putting the silencer on the barrel changed the POA to POI to 5" low at 100 yards. Ammo here was 168gr Hornady Match and that 5 shot group was 7/8" with the silencer. The SWR Omega 300 is a heavy, but very effective can! (10.5" long, 32oz of stainless steel, and rated for 300 WMag.) The drop with the 200 gr subsonic ammo was 11-12" at 100 yards. That subsonic ammo is VERY quiet (and fun

), but not for long range shooting.

I'm looking forward to trying out this rifle, silencer, and different types of ammo again when it is not 40 degrees and drizzling.

BenL · Feb 8, 2011

rsideout said:
That subsonic ammo is VERY quiet (and fun), but not for long range shooting.

Would you say it's hearing safe?

rsideout · Feb 8, 2011

BenL said:
Would you say it's hearing safe?

Yes. It is easily hearing safe, down in the suppressed .22LR range.

Minuteman · Feb 8, 2011

Jeff says it's hearing safe

rsideout · Feb 8, 2011

Minuteman said:
Jeff says it's hearing safe

That was full powered ammo.......and loud compared to subsonic loads.

rsideout · Feb 12, 2011

Here is a quick video that I shot today of 2 rounds of this subsonic .308 ammo. The silencer is an SWR Omega 300.

JC308 · Feb 14, 2011

I have load up some .223 sub for my bolt gun. Some people talk about drilling out the flash hole. I just use a magnum primer to light the low charge. And it works very will.
That's my 2 cents.

Maryland_Shooter · Feb 16, 2011

rsideout said:
I don't reload, but here is some SubSonic .308 ammo that I bought on GunBroker. It is VERY quiet.

Nice it has the recipe right on it.

SgtKope · Feb 23, 2011

BenL said:
Would you say it's hearing safe?

snap your fingers... Do you need ear pro? Cause that is about how loud they are thru a can.

Abacab · Jan 24, 2012

Would subsonic .308 cycle an AR platform gun? I doubt it but just asking. Just picked up my first .308 rifle.

Markp · Jan 25, 2012

Abacab said:
Would subsonic .308 cycle an AR platform gun? I doubt it but just asking. Just picked up my first .308 rifle.

With a suppressor it might. However you probably would need an adjustable gas block and to open up the gas port.

.308 Subsonic Load

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