Searching for 7.62x39 subsonic loading data

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Tobi
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Searching for 7.62x39 subsonic loading data

Post by Tobi » Tue May 17, 2005 7:38 am

Hi folks
I am searching for 7.62x39 subsonic loading data with 200 gr bullet.
Lapua produces such ammo, but only for LE.
Hope someone could help me.
Best regards
Tobi

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Suputin
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Post by Suputin » Tue Aug 30, 2005 11:11 pm

All these loads utilize a magnum primer and a moly coated 200 gr bullet.

7.7gr Red Dot
8.0gr HP38

I have a bunch of test loads built on N310 and AA5 to test but no time to go to the range. :?

I am shooting these in a bolt action rifle. No guesses as to how they might work in a semi.

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Post by PKM » Tue Jan 10, 2006 5:53 pm

Hodgdon H322 1.05g (16.2grains).
Lapua B416, 13g (200grains) or D166 13g (200grains).
Keeps the gun self reloading- atleast with a BR reflex supressor R12AK.

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Post by Tobi » Wed Jan 11, 2006 2:36 am

Thanks,
I will try it.
Best regards

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Post by Artful » Wed Jan 11, 2006 12:10 pm

PKM and Suputin - what kind of accuracy are you getting and what twist are your barrels :?:

And thanks for the info.
"Trying to tax yourself into prosperity is like standing in a bucket and trying to pick yourself up by the handle." - Winston Churchill

illuzion30
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7.62x39 subson

Post by illuzion30 » Thu Jan 12, 2006 2:12 pm

Heh, I just registered to see if I could find out more on 7.62x39 subson myself. After finding http://members.shaw.ca/cronhelm/762Page.html, I e-mailed Peter Cronhelm and he gave me some reloading data a few weeks ago that I've *not tested*:

Military surplus 145gr FMJ-BT seated backlwards no crimp
6.0gr Red dot Velocity @1000fps 50% load density
Win cases, WLR primer flash hole drilled 9/64"

Hornady 168gr AMAX backwards no crimp
6.0gr red dot Velocity @950fps 50% load density
Win Cases, WLR primer flash hole drilled to 9/64"
NOTE: reportedly works good in 1:10" twist and reported good for hunting (not deer, varmits)

180gr Sierra
17.0gr Win748 [email protected]
WLR primer Win cases

200gr Speer FB No crimp
8.0gr red dot [email protected] 70% load density
WLR, WIN Cases flash hole drilled 9/64" pentrated 6 2X4's

180gr SPBT
10.7grs IMR4227 [email protected]
CCI200 primer WIn cases
clean and accurate

200gr SPBT
11.0gr IMR4227 [email protected]
CCI200 WIN case
accurate and heavy, good penetration

180gr SPBT
7.0gr IMR SR7625 [email protected]
CCI200 WIN case
Very clean burning, excellent accuracy, best so far

200gr SPBT
7.8gr IMR SR7625 [email protected]
CCI200 WIN case
Very clean burning, very good accuracy

Only problem is that these rounds will not cycle an AK... I was hoping to get some data for even lower weight projos so I could use M2 AP pulls (163 grains, I believe). I've considered buying a pressure gauge and seeing if I could come up with a 163-grain subson 7.62x39 load, but it will likely be a while before that project comes to fruition.

Also, it might be of some interest to you that EBR has subson 7.62x39 loads that you can get from SRT or "The Gun Runner".

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Post by Suputin » Thu Jan 12, 2006 8:21 pm

I was hoping to get some data for even lower weight projos so I could use M2 AP pulls (163 grains, I believe).
Email me again and I'll give you some loads for 150 gr bullets.

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Tobi
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Post by Tobi » Fri Jan 13, 2006 2:55 am

@ illuzion30

Great post, THANKS!!

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Post by Artful » Sun Jan 15, 2006 1:36 am

"Trying to tax yourself into prosperity is like standing in a bucket and trying to pick yourself up by the handle." - Winston Churchill

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Post by Suputin » Sun Jan 15, 2006 1:45 am

Those are my web pages. 8)

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Post by Artful » Sun Jan 15, 2006 1:56 am

Suputin wrote:Those are my web pages. 8)
Good sites - but boy is my face red :oops:
"Trying to tax yourself into prosperity is like standing in a bucket and trying to pick yourself up by the handle." - Winston Churchill

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load

Post by steel » Mon Feb 06, 2006 9:34 pm

Has anyone tried a 7.62x39 load using red dot and 180gr RN bullets? If so what is the load you are using? Thanks

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load

Post by steel » Mon Feb 06, 2006 9:34 pm

Has anyone tried a 7.62x39 load using red dot and 180gr RN bullets? If so what is the load you are using? Thanks

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Post by Suputin » Tue Feb 07, 2006 12:06 am

The following are built with a Hornady 180gr RN moly coated bullet. Primer flash-holes are reamed out to 9/64" and a magnum primer used. Velocities are from an 18" barrel.

N310 6.0gr (~40% density) = 990 fps
Red Dot 6.0gr (~60% density) = 932 fps
N320 5.9gr (~45% density) = 990 fps

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thanks

Post by steel » Wed Feb 08, 2006 2:49 pm

Thanks for the starter load. I will up that red dot load some and work down to around 950-1000FPS out of my rifle. The first load I was looking to do was red dot and the 180gr hornady round nose myself with a coating of moly so it's great you listed that load!

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Re: Searching for 7.62x39 subsonic loading data

Post by Tobi » Mon Apr 02, 2012 5:17 am

I found some new info.
"180 grains Sierra bullets in .311 diameter and 11.5grains Accurate 5744-powder. This combination is subsonic and cycle properly in my bulgarian AKM-47."
and

"12 grains of 5744 drives the Fatter 30 boolit (200 gr.) out my IO Inc. AK at 1150 FPS and cycles the action. Gonna try 11.5 and 11 grains tomorrow to get the velocity down and see if they still cycle. I'm a little amazed that this wide-meplat boolit feeds from the mag like poop through a goose! I can't give group size results, as the front sight needs to be adjusted badly. Groups are nearly a foot to the right (from the factory)."

any suggestions?

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Re: Searching for 7.62x39 subsonic loading data

Post by TallestDutchman » Wed Feb 19, 2020 10:04 pm

First post and I’m reviving a dead thread...great start, right?

This thread comes up when searching google for subsonic 7.62x39 loads. I wanted to update it for anyone else searching for subsonic loads for an AR-15 in 7.62x39.

I used Speer 180 grain soft points with 11.5 grains of Accurate 5744.

They are subsonic and cycled the AR action.
The POI is 12 to 14 inches lower at 100 yards than standard wolf ammo.
I was shooting a 16” barrel with a 9mm suppressor (a strong 9mm suppressor...).
I have an adjustable gas block on the AR and it cycled with it half open, 10 clicks out of 20.

12 grains is supersonic. I did not chrono nor try to group them. I was more interested in cycling and ejection and such.

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Re: Searching for 7.62x39 subsonic loading data

Post by Gunny 1969 » Wed Nov 04, 2020 10:17 pm

Hello
Silencer enthusiasts
I have a Yugo M70ab2 with a silencer
I have experimented for some time to determine an adequate subsonic charge for the 7.62 x 39 with which will cycle the action
automatically without any problems, without making changes to the weapon, such as shortening the main Spring or driling the gasport hole bigger.
There are many factors to consider.
The AK system requires a lot of gas to cycle.
I used the quick load reloading software to find out proper loads without going over max pressure.
With most powders subsonic loads wont cycle propelry even at max pressure mostly it ejects but with many malufunctions.
I used any type of Bullets betwen 160 and 220 Grs
There is just a very small gap betwen loads less than 40% of carge with the danger to get a Second explosion effect or have overpessure or supersonic speed of the Bullet.
But mostly the action just wont cycle properly !
Years ago I was just shortening the mainspring and it worked perfect with pistol powders such as Vithavuori 3N37
I figured out that the goal is to find a load wich produces enough Gas to cycle and have low pressure enough to keep the Bullet below the speed of sound .
But the charge must have more than 40% of load volume and more than 1000 Bar chamber pressure to keep the powder burning
What makes this problem even more difficult is that many manufacturs of AK rifles using different gasport hole sizes.
Unfortunaly Yugo AK using one of the smalest Holes.
Now i figured out a well cycling recipe
I used :

Bullet : .308, 220, Sierra HP MatchK 2240
Powder : 18,4 Grains Vihtavuori N160
Brass : S&B
Primer large Rifle

The data calculated by Quick load:

Muzzle velocity : 330 m/s
The charge volume should be 97% ( but iam shure its a press charge it means more than 100% )
The max chamber Pressure is about 1180 bar.
This load is quiet like a surpressed .22 long rifle
The the loudest audible sound is cycling the action and a whirring sound of the main feather.
with a hum of the bullet in the air and Impact noise at the end.
like " tsching sssssssss fump "
The Silencer is a Chinese Ali Express Solvent trap Aluminium 2" diameter 10"long with 10pcs 60° cone Baffles
I schoot now about 100 rounds without a single malufunktion.
But the only problem what makes me a headache is that the silencer and the whole gun is very quick icredebly full of unburnd Powder after even few rounds.
I am a little scared that the unburned powder could ignite after a while not cleaning.
I think its becurse of the very low " shot start iniation pressure" in the Chamber in combination with low chamber pressure overal ?
I was thinking about to use magnum primers first than may bee drill flashloes bigger.
And last try with a long cable triggerd from distance somthing like a duplex load to ignite the powder properly ?
like 0,1 Grs Red dot starting charge with 15- Grs N160 on Top in same case ? Thats may bee dangerous becurs the pressure and the
burning characteristics cant be calculated anymore ?
Is there someone who has experience with unburned powder and this kind of loads ?
Greetings Sascha

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