308 subsonic

[Cornholio]

That's interesting data. Thanks!

So when you were testing, you were using the 23" bbl for the .308 and the 16" bbl for the Whisper?

If so, that tells me that the Whisper is INHERENTLY a quieter round than subsonic .308, even though they are pushing the same bullet at the same velocity. This is fascinating. I need to stop wasting my time with making subsonic .308s, and get myself a Whisper bbl for my Savage!!!

[Thumper_Three0Eight]

That is what I would recommend... I talked w/EBR and found thier powder is better. I do NOT recomend TTI armory.

I have a 20" savage w/an AWC thundertrap and found EBR to be the best.

I am, however, about to start shooing 7.62x39 jackhammer as soon as I can find a twist rate I want to shoot the heavy load.

Here are some details...
http://www.ebr-inc.net/LowbandAmmoDetail.asp?id=3

I want .300 whisper, but her of so many problems that I am affriad to try it.

[Artful]

HTG website

[b1g_b0re]

I was told someone made .308 brass with much thicker walls around the web/base so the volume was low. I can't find it.

[sniperx]

Well, I am just going to have to bump this up to the top. I have started
looking into some subsonic 308 projects as well now. I was hoping to see
as much on the 308 as there is on the whisper here Just kidding.
I have found a little tidbit that may be helpful to fill the case. The product is
Pufflon http://www.pufflon.com/

Looks like the Unique at up to 8.5grn with 150grn bullets is one that I have
heard of but not tried, yet. Was told to start a little lower and work up to speed.


Also have heard that Mullins Ammunition has the info but would probably not
let any out. Has anyone heard this or know anyone over there??


Lets see if we can get this thing going again

[d-mon]

I heard about pufflon.
My question is how do you make it work in a silencer with out filling your silencer with that "magic stuff"? :D

ND

[sniperx]

Roger on the puff-lon. That was my question to them.


Flash cotton seems to be a better choice, but it may effect the charge
a little. I talked to one gentleman who is using it and it works quite well.
On the other hand, one of the main "dudes" does not use any filler at all.

[d-mon]

In france, most experienced subsonic shooters,do not recommend to use any filler.

ND

[Artful]

link on another website 'bout 308 subsonic loads
http://www.silencertests.com/silence...opic.php?t=169

Basically using Trailboss powder - very bulky working very well for them.

Debo's Results-

200gr Speer Spitzer SP, 11.7gr Trailboss, CCI250 (Large Rifle Magnum) primers, Federal GMM brass, 70 degrees-

Shot through 20" Douglas SS bbl, 1 in 10 twist, SRT Shadow suppressor.

MV for three shots with 11.7 gr was

1031
1029
1061

This was preleminary. Going to load up some and head to the range later this week hopefully.

Scott- yes they stayed subsonic. I worked up from 9gr (604fps), 10gr (824fps), 11gr (986fps), 11.5gr (1009fps), 11.7gr (1031,1029,1061fps).


Debo


also this...

Quote:
If anyone would sacrifice a commercial subsonic round, it would be interesting if they'd dismantle one (safely, of course), and see just what kind of volume the powder charge actually displaces. Also, if the flash hole appears to be larger than normal.

Reply
I already did:

EBR 180gr subsonic has some strange powder I have never seen in it. I don't remember the exact load density but there is lots of room for the powder to slosh back and forth inside. The flash-hole is not enlarged.

Lapua 200ge subsonic has what looks like a N310 but with smaller granules which would indicate it is even faster burning than N310. The flash-hole is not enlarged.

End Quote

[Debo]

Hey guys,
Lurking around on this forum and saw my name mentioned

I am still working on the subsonic .308 load. The 11.7gr ended up being very inconsistant with velocity. My latest is 200gr Speer Spitzer, 12.3gr Trailboss, CCI magnum primers, Federal brass with flashhole drilled out larger. It seems to be working pretty well giving me 1030 to 1070fps or so and 1.5MOA groups. I feel like I have to test it a little more but I am going to make a nice writeup on Silencertests and I will cross post here and Snipershide.


Debo