Guys,

I have a 1:10 twist .308 Savage that I think it might be fun to suppress. Am interested in what maximum projectile weight I might expect it to stabilize in subsonic use.

Anyone help me?

Thanks!

twist calcs work on bullet length --
i don't have quickload on this PC
assuming 1050fps, the max LENGTH of a 308 bullet in a 1:10 twist is 1.42" long

Be very careful with long for caliber bullets in a .308 at subsonic velocities. They may in fact be fully stable after 100yrds but still be wobbling at the muzzle. This can lead to baffle strikes. Its for this reason I'm not a fan of subs in large capacity rifle cases. Chrono your rounds and watch for big velocity variences. Try it on a can you don't mind losing.-Rob

Rob,

Will certainly check stability close to the muzzle.

I suspect this is not going to be a satisfying endeavor ... and that the 1:8 300 WTF will work better for subsonics.

180 round nose according to the guy's at silincertalk .com. 300 blk or 300 wisper is the way to go for 30 cal subsonic. Moa in bolt guns is not to hard to achieve. As quiet as a daisy red rider bb gun.
Factory ammo by rem, and hornady now avaible with more loads comeing real soon.


You got a old 222 or 223 laying around


JD

JD,

Actually have a 300 BLK 1:8 16" AR already working. Given that 30 cal and 9mm suppressors are already in process ... was wondering if it might be fun to play with .308 Win subs as that barrel is going out to be threaded.

I ll be doing the same. I have a 44 mag marlin that i will play with and a single shot sako with a 308 bolt face ,thatis a switch barrel rifle, I will add a 45 acp and a can to the set.
JD

I used 170 round soft points (30/30 bullets) in my 1:10 twist Hart barreled 700. I loaded with Trailboss powder and got about 60-70% case fill. I tried a lot of experimentation with the rounds due to the less than 90% fill. I loaded the rounds in the mag, shook the rifle laterally to make the powder lay flat in the case and fired a round through a chrono and into a 100 yard target. Next round I held the rifle muzzle up to move the powder column to the rear and fired as aboe, and then finally, held the rifle muzzle down to move the powder to the front, away from the flash hole, and repeated. This group was around .800" and velocities were within 12 fps.

finally, I fired five rounds of each format of powder column considering that the rifle recoil might have some effect on the data, and found no difference.

I was satisfied with the results enough that I used the same load in my AR10T suppressed. It obviously didn't cycle the action, but functioned as a straight pull bolt action, and sounded quieter than the 700. (700 was 20", AR10T was LW barrel cut to 22.5")

For suppressor use of subsonic ammo I would go with a 170gr Flat Point 30/30 bullet.

You will not get much expansion, so the Flat point will be an advantage. Also the Flat poing is short for its weight and shouls stabilize enough out of the barrel as not to hit a baffle and "knock" your suppressor off of the rifle.

Trail Boss seems to be the powder of choice, for subsonic loads.

Kletzenklueffer.

What charge weight did you finally arrive at with all this experimentation?

Thanks,

I just found a 14 page Quarterbore thread on subsonic .308 Win.

Sounds like a PITA to me!

May save that little exercise for a time when I just don't have anything else to do ... and use the 30 cal suppressor on the .308 to reduce the noise level a bit.

Whisper/WTF does seem to be a much more sensible thing to suppress due to the much reduced case volume.

Mike

I would start with 10.5gr of Trail boss with a 170 to 180gr bullet in the 308.
Depending on your particular set up 11.7 would be about max, the idea being to stabilize the bullet and say subsonic.

WARNING USE THESE LOADS AT YOUR OWN RISK.

Also I would recommend that you first shoot these loads with the suppressor OFF of the rifle. Shoot through thick cardboard at @10 feet to see if there are any signs of tipping.