Sub sonic 7.62x39 questions

[Pinkerton]

Hi,

I know standard bullets are 123grain.

What weight is necessary to be sub sonic?
158? Higher?

Thank? you,

Pinkerton OUT!

[bradbn4]

Just a few years ago I did not think that there was such a thing...and to get sub sonic you had to reload your own.

The standard rule of thumb is to keep stopping power the same as supersonic ammo you need to increase
the weight of the round.

https://www.hornady.com/ammunition/r...-x-subsonic#!/

so my wild guess would be 200 grain or higher would be ideal - assuming the rifle can feed that size bullet / cartridge.

look on line for some free hand-reloading manuals and that might give you a clue of what is out there.



[added]
Based on the data in the link - check the amount of hold over at 200 / 300 yards. Going to say as most subsonic rounds
they are not designed for long distance. And for this round anything much past 100 yards is long distance.

there are lighter weight subsonic rounds - going to be - depends on what you are shooting at if they will have the
power rating you need.

[Pinkerton]

Thanks!

[Great-Kazoo]

here's a discussion on this subject.
https://www.theakforum.net/threads/s...opment.238569/


Here's a link for x39 load data.
https://shootersreference.com/reloadingdata/762-x-39/

IMO it's not so much the weight of the bullet as it is how many Feet Per Second you're getting. Keeping it @ 1100 or slower works. 1100FPS gets a little louder report, suppressed.

First thing you need to do, if not done already is. Check bore to make sure it's concentric to avoid baffle strikes.

Titegroup and trailboss are my 2 go to powders for sub sonic handloads. I see Accurate 5744 and Accurate #2 are showing the 1k fps range. While i have not tried reloading x39 subs, i've done 223 and 308's.

The 223 with a 12" drop @ 100 yds (1:8) bbl was dismal. I see the load data for sub 223 is using a 1:12 twist rate, which i'll eventually buy.

The 308 is 14 gr TB using a 147 or 150 gr fmj hornady bullet, 1:12 LTR rifle. That sounds like a suppressed 22 with minimal drop @ 100 yds.

I'd be curious what results you see, depending on bullet weight and powder.

IMO with the average twist rate of 1:9.5 for an AK, Or 1:10 with a US bbl, lighter bullets will net better results. Those heavy bullets drop substantially @ 100 yds.
Whatever you do, run it unsuppressed @ 50 then 100 yds to see if your rounds are tumbling / keyholing.



SInce i have the powders i suggested, along with brass, bullets and dies. I might venture into loading some subs, as well.

[Little Dutch]

For my commie upper AR15?s, this is my load;

The POI on these is 12 or 14 inches lower than standard wolf loads at 100 yards. These cycle an AR-15 fine, and are great suppressed.

Speer 180 grain round nose
11.5 grains of Accurate 5744
Seated so they fit in the magazine.

12 grains is supersonic.



174 grain Sierra Matchking
11.5g Accurate 5744. I suspect 11.7 may be a better load than 11.5 on these, but the accuracy was much less than the 180?s in both my uppers so I didn?t investigate further.

[Pinkerton]

Thank you all!

Pinkerton OUT!