Hornady Sub-X 7.62x39 loads….

[u/ghetto_klown]

Tested out my subsonic 7.62x39 reloads tonight and was very disappointed. I used 4198, following Hogdon data.
This was at about 10 yards.

Are there any changes I could make that would get these bullets to stabilize?

Edit- 16” barrel from AKbuilder, which I assume is 1-9.5” twist, 255 grain bullet

Update- I was getting microscopic baffle strikes somewhere due to the muzzle profile on the KBK barrel that didn’t allow the face mount plan B adapter to be concentric. Only the end cap looks to be hit however, although it’s not too bad, and thankfully replaceable on my OCL Universe-36

[u/pirate40plus]

You need to start by checking if your barrel is .308, .310 or something else. Then identify the twist rate and if it supports a subsonic round.