Thread: Best 7.62x39 subsonic loads and tips

leave them alone if they work well.mine seat a liitle less deep but I go deep enough to keep the lubed groove inside the case...I believe you will still be supersonic at 8 grns and will be right down to closer to 6grns. poked a couple of these out of my 08 yesterday and they just as much fun out of that as the x39.
plurry tidy job on the mag.

The 7.62x39 does not use a 308 projectile but .312"diam'and shooting a 308 lead bullet requires the bullet to bump up to fit the barrel which causes bullet deformity and usually leading of the barrel. The Norinco JW103 has a fairly loose chamber with a steep leade to the rifling. If you use an undersized bullet set back from the rifling in a sloppy chamber the bullet case and projectile are not lined up with the bore and when fired will deform as it enters the bore and unless it bumps up to fill the rifling will then rattle down the barrel with an offset center of gravity which when it exits the barrel will cause a deviation as it then follows the true center of gravity. Seating the bullet further towards the rifling straightens the cartridge up in the chamber and normally improves accuracy. If you take a fired unsized case and fit a projectile in it you will see how much play there is in the chamber. I shoot 205 grain lead bullet sized .314 (1.5 to 2 thou over bore diam) into 1" at 100m(on a good day) .I seat the bullet out as far as the mag allows. I use unique and AP50 with good results.

The Russians designed this cartridge with a .311 projectile, the Americans use .310 . The 3 Norinco 7.62x39 I have owned bore slug to .3115 to .312. (from new) I have found with the right sized projectile and BH they are capable of extreme accuracy up to around 1700fps.

some cartridges...the .308 winchester for one... were designed in such a way that it is better to seat the buller really well in the case so it can line itself up with aid of case neck before it makes a "space walk" into the beginning of the rifling.
my norinco loves those 151s and havent seen leading as an issue...yes the cleaning patches come out black...but not a major issue.

bottom line is experiment and FIND OUT WHAT YOUR RIFLE prefers.....

The black stuff is only carbon and bullet lube, if the lube runs out before the projectile leaves the barrel you will get leading, check the muzzle
it should have a star shaped deposit of lube if so the lube is working properly, lead fouling starts out with little flakes of lead that get bigger
if not cleaned out with solvent soaked patches it ends up as long streaks of lead which are bastards to clean out