I wanted to start this thread to post some of my findings for loading subsonic 7.62x39. I have had some members ask previously to post my load data. So I will continually update this thread as I come up with new loads and range reports. For now, I am generally listing info and not specific load data because of the many variables concerning the subject. I currently do not have any pictures of group sizes from past experiments but I will do some shortly and post them here for members to see. Also if other members would like to share their info and experience don't be shy.
Please feel free to list your Firearm, barrel length, suppressor type, and load data.
First off this is NOT a guide or how-to. This is strictly my own findings and I DO NOT encourage anyone to try and use any of the data I am going to list in this thread. Reloading is extremely dangerous especially when loading subsonic ammo. You endanger yourself, your firearm, and your suppressor while doing so. I am not responsible for any injuries or damage to you or your equipment. If you plan to load any type of ammo make sure you have sufficient knowledge and skill to do so competently.
Here are my two test rifles
Top SBR has 11 1/2 in barrel
Bottom Yugo M70 16 1/4in barrel
AAC 7.62 SD Suppressor
This is not finished data only experiments with IMR 4227 and different weight projectiles
From left to right are the lightest to heaviest projectiles
110gn FMJ .308 cal ONLY projectile that is not .311-.312
123gn Hornady V-Max
124gn Tula SP
147gn 7.62x54R pulled projectile
150gn Sierra Spitzer
169-170gn Cast lead powder coated projectile LEE Mold CTL312-160-2R
174gn Hornady HPBT
180gn Sierra Spitzer
180 gn Speer Hot-Core Round nose
188-189gn Cast Lead powder coated projectile LEE Mold C312-185-1R
Projectiles Seated to 2.200 to show how deep some projectiles seat into the case.
110gn FMJ is just seated about .250 into the neck of the case
Cases have a modified flash hole opened up to a #40 drill bit at .098
Using CCI #.200 large rifle primers
Generally speaking for my rifles
I have found that a safe charge of 11gn of IMR 4227 will Push ANY weight projectile I have listed subsonic out of the Draco SBR. All projectiles will stabilize with this charge as well and none will travel less than 900 fps. Cycling will depend on your particular firearm but the 110gn does not cycle at all and the 180gn round nose will give me feeding issues. I tend to push mine a bit slower to achieve a quieter sound generally around 950-1000FPS. I live about 350ft above sea level and at 1060fps I get a supersonic crack. 950-980FPS is where I like to keep mine for ultimate quiet but not all loads function properly at that speed.
My loads out of the full-sized AK with 16in barrel had to be reduced slightly. 10.5-11gn of 4227 to stay subsonic. I have shot most loads out of this rifle but cannot get consistent data from the worn barrel.
Function and FPS depends on your particular rifle. Always start High with your loads and reduce the charge to achieve the desired function in your particular AK. A good starting charge of 12gn with any of these projectiles will safely get the projectiles out of the barrel so you don't get a squib.
For reference only do not use
From Draco 10.5in barrel
110gn FMJ 10.5gn 988fps
123-124gn 10.5gn 900fps
147-150gn 10.5gn 1015fps "147gn 54R steel core projectiles do not stabilize below 10.5gn and 1000fps"
170gn lead projectile 11.6gn 1005fps
174gn HPBT 10.5gn 1037fps
180gn Speer Spitzer "could not find my previous data"
180gn Speer Hot Core round nose "could not find my previous data"
188-189 Lead cast projectile 11.1gn 990 fps
Data for Full sized AK with 16.25in barrel too inconsistent will list some good results though. I could not locate my old load data with other projectiles but will update the thread when I do.
169-170gn lead projectile 10.6gn 980fps
188-189gn lead projectile 10.5 964fps
Will be updating this thread as I find more of my info and range test these loads and projectiles more. I'll post some pics of accuracy and generally FPS readings.
Arsenal SAM7K SBR Krink data still to come.
Please feel free to list your Firearm, barrel length, suppressor type, and load data.
First off this is NOT a guide or how-to. This is strictly my own findings and I DO NOT encourage anyone to try and use any of the data I am going to list in this thread. Reloading is extremely dangerous especially when loading subsonic ammo. You endanger yourself, your firearm, and your suppressor while doing so. I am not responsible for any injuries or damage to you or your equipment. If you plan to load any type of ammo make sure you have sufficient knowledge and skill to do so competently.
Here are my two test rifles
Top SBR has 11 1/2 in barrel
Bottom Yugo M70 16 1/4in barrel
AAC 7.62 SD Suppressor
This is not finished data only experiments with IMR 4227 and different weight projectiles
From left to right are the lightest to heaviest projectiles
110gn FMJ .308 cal ONLY projectile that is not .311-.312
123gn Hornady V-Max
124gn Tula SP
147gn 7.62x54R pulled projectile
150gn Sierra Spitzer
169-170gn Cast lead powder coated projectile LEE Mold CTL312-160-2R
174gn Hornady HPBT
180gn Sierra Spitzer
180 gn Speer Hot-Core Round nose
188-189gn Cast Lead powder coated projectile LEE Mold C312-185-1R
Projectiles Seated to 2.200 to show how deep some projectiles seat into the case.
110gn FMJ is just seated about .250 into the neck of the case
Cases have a modified flash hole opened up to a #40 drill bit at .098
Using CCI #.200 large rifle primers
Generally speaking for my rifles
I have found that a safe charge of 11gn of IMR 4227 will Push ANY weight projectile I have listed subsonic out of the Draco SBR. All projectiles will stabilize with this charge as well and none will travel less than 900 fps. Cycling will depend on your particular firearm but the 110gn does not cycle at all and the 180gn round nose will give me feeding issues. I tend to push mine a bit slower to achieve a quieter sound generally around 950-1000FPS. I live about 350ft above sea level and at 1060fps I get a supersonic crack. 950-980FPS is where I like to keep mine for ultimate quiet but not all loads function properly at that speed.
My loads out of the full-sized AK with 16in barrel had to be reduced slightly. 10.5-11gn of 4227 to stay subsonic. I have shot most loads out of this rifle but cannot get consistent data from the worn barrel.
Function and FPS depends on your particular rifle. Always start High with your loads and reduce the charge to achieve the desired function in your particular AK. A good starting charge of 12gn with any of these projectiles will safely get the projectiles out of the barrel so you don't get a squib.
For reference only do not use
From Draco 10.5in barrel
110gn FMJ 10.5gn 988fps
123-124gn 10.5gn 900fps
147-150gn 10.5gn 1015fps "147gn 54R steel core projectiles do not stabilize below 10.5gn and 1000fps"
170gn lead projectile 11.6gn 1005fps
174gn HPBT 10.5gn 1037fps
180gn Speer Spitzer "could not find my previous data"
180gn Speer Hot Core round nose "could not find my previous data"
188-189 Lead cast projectile 11.1gn 990 fps
Data for Full sized AK with 16.25in barrel too inconsistent will list some good results though. I could not locate my old load data with other projectiles but will update the thread when I do.
169-170gn lead projectile 10.6gn 980fps
188-189gn lead projectile 10.5 964fps
Will be updating this thread as I find more of my info and range test these loads and projectiles more. I'll post some pics of accuracy and generally FPS readings.
Arsenal SAM7K SBR Krink data still to come.