Thread: Best 7.62x39 subsonic loads and tips

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.