762x39 Subsonic hand loads - Graybeard Outdoors
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post #1 of 12 (permalink) Old 01-12-2020, 11:55 AM Thread Starter
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Default 762x39 Subsonic hand loads

I am looking for information or links regarding handloads for subsonic loads for this cartridge. Thank you in advance for any information.

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post #2 of 12 (permalink) Old 01-12-2020, 12:02 PM
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I have seen some loads using Unique I believe and will try and find...


That said you may have a problem trying to stabilize heavy bullets without the 1/7 twist that a .300 Blackout has...

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post #3 of 12 (permalink) Old 01-13-2020, 06:27 AM
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do they have to run an action in an ak or ar or just for bolt guns?
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I am looking for information or links regarding handloads for subsonic loads for this cartridge. Thank you in advance for any information.

Cheesehead

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post #4 of 12 (permalink) Old 01-13-2020, 11:19 PM Thread Starter
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do they have to run an action in an ak or ar or just for bolt guns?
My goal is to function in my AR15. However, I do have a bolt gun chambered for this cartridge, so both, lol.

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post #5 of 12 (permalink) Old 01-15-2020, 06:08 AM
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Problem your going to run into in ars is the round is already long for the magazine. That prevents seating bullets made for the bo out far enough to get a grip on the bullet by the neck. seated that deep most bullets are going to be to the point your trying to get a grip where the bullet is tapering into a nose. Add to that that about all the heavy bullets are 308 and not 311 so make sure your gun has a 308 barrel. Then check your buffer. good chance you have something other then a standard 3 oz carbine buffer in there and maybe even a heavy spring. Id start with a standard 3 oz and a standard carbine spring. Then you may have problems with getting enough gas to run the action. It will probably take drilling out your gas port and getting an adjustable gas block. 762s are tough to get a 100 percent reliable with supersonic. Subsonic is going to be a challenge. Bottom line is it would be a lot less bother to buy or put together a 300 blackout upper. I did that and still wasn't really happy. Subsonic loads are DIRTY! Your constantly cleaning your gun. Anymore I use subsonic in my American in 300 bo. That way I can use any bullet weight and a light charge of powder. My go to load in mine with a suppressor is 4.5 grains of unique and a 130 cast spitzer. Quiet and its cheap shooting. You could do the same in a 762x39 too. Even if cast bullets are 308-309 you can use pc coating on them and gain enough to work at 311. Bottom line though is the experimenting with what you want to do brought us the 300 black out. For good reason

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post #6 of 12 (permalink) Old 01-15-2020, 08:15 PM
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Sierra 180 gn .311 diameter bullet over 12 gns of W296 powder; gets you about 1100'/sec
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post #7 of 12 (permalink) Old 03-05-2020, 01:47 PM Thread Starter
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I have been using load data from the 300 black out as a starting point with great results.

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post #8 of 12 (permalink) Old 03-13-2020, 05:11 AM
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proably the most used powder by guys that actually get an ar to run with 300 bo subsonic is 1680. Id try that and a bullet at least a 180 grain, preferably over 200. Might have to change your recoil spring if its an ar15. Most 762x39 ar15s run a 308 weight spring. Maybe a standard carbine spring and a standard 556 weight buffer. With the longer case a 762x39 has over a 300 bo you might run into problems with seating some bullets. You will be on the ogive (tapered part of the nose) when you seat a bullet that heavy in a 762x39 case and keep the overall length short enough to fit in an ar magazine. Its kind of why most who want sub sonic don't even bother with the 762. They just get a blackout.

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post #9 of 12 (permalink) Old 03-20-2020, 08:03 AM
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Hi ,hav'nt dropped in for some time . Wish youall well in these troubled times. Cheers Garry.

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post #10 of 12 (permalink) Old 03-20-2020, 08:14 AM
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Look to the 30 Herrett loads for starting point.
Similar case volume and bullet weight
consider Trail Boss

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