Searching for 7.62x39 subsonic loading data
Searching for 7.62x39 subsonic loading data
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
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
-
- New Member
- Posts: 1
- Joined: Thu Jan 12, 2006 1:54 pm
7.62x39 subson
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".
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".
http://members.shaw.ca/cronhelm/DevelopSubsonic.html
http://members.shaw.ca/cronhelm/762ProjectRifle.html
http://members.shaw.ca/cronhelm/QuieterCoyoteRifle.html
something that might be of interest ...
http://members.shaw.ca/cronhelm/762ProjectRifle.html
http://members.shaw.ca/cronhelm/QuieterCoyoteRifle.html
something that might be of interest ...
"Trying to tax yourself into prosperity is like standing in a bucket and trying to pick yourself up by the handle." - Winston Churchill
thanks
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!
Re: Searching for 7.62x39 subsonic loading data
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?
"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?
-
- New Member
- Posts: 1
- Joined: Wed Feb 19, 2020 9:51 pm
Re: Searching for 7.62x39 subsonic loading data
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.
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.
-
- New Member
- Posts: 1
- Joined: Wed Nov 04, 2020 8:41 pm
Re: Searching for 7.62x39 subsonic loading data
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
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