Thread: 7.62x39 subsonic

well Im still in process of trying to get mine down to cat sneeze volume.... was loading 6-7 grns trail boss behind a cast 151 grn pill with magnum primer but they still about same noise as subsonic .22 if not slightly more..... its got me stumped as they seem louder now than when I first made some up a couple of years back.....
recently tried without the magnum primer and have reduced down to 4.5 grns TB ....they much quieter....might just have to put some over chrony to determine if issue is suppressor is no longer functioning as it should..... still plurry good fun and drop my house muttons without any fuss,head shots at 25yards.

Originally Posted by Micky Duck

well Im still in process of trying to get mine down to cat sneeze volume.... was loading 6-7 grns trail boss behind a cast 151 grn pill with magnum primer but they still about same noise as subsonic .22 if not slightly more..... its got me stumped as they seem louder now than when I first made some up a couple of years back.....
recently tried without the magnum primer and have reduced down to 4.5 grns TB ....they much quieter....might just have to put some over chrony to determine if issue is suppressor is no longer functioning as it should..... still plurry good fun and drop my house muttons without any fuss,head shots at 25yards.

Rather than drop the load, have you tried heavier bullets? 220gr or 200gr casts. That will further slow the bullet speed without reducing energy.

Originally Posted by timattalon

Rather than drop the load, have you tried heavier bullets? 220gr or 200gr casts. That will further slow the bullet speed without reducing energy.

The twist rate of the JW doesn't lend itself to projectiles that heavy unfortunately. From what I have read 170gr is about the max. Also, the more mass you can push, for the same velocity = more kinetic energy. Obviously with a V^2 function speed is nice, but when you are capped by being under the magic 1050 fps that extra 15gr can't be a bad thing.