To slug or not to slug. That is the question. I'm trying to determine the bore diameter of a chrome lined VZ58 in 7.62x39. Should be somewhere in the realm of .310-.312. So I thought I would check Norinco bullets and Hornady 7.62x39 and I end up in that .308 range. Now .308 will work but at a great loss in accuracy or so I'm told. So have any of you that have chrome lined VZ58 confirmed a bore diameter? I wonder if the addition of the chrome lining in the barrel has reduced the bore diameter. Thanks. I may just have to give slugging the barrel a try.
Bore Diameter of VZ58
- Thread starter choppy99
- Start date
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gewehr76
CGN Ultra frequent flyer
You don't have to slug anything. If you really need to know your bore diameter then just insert carefully inner measuring jaws of your vernier caliper in to the muzzle of your rifle and read the measurement value. That is it.
Chrome lining should not make bore tighter, it should be just harder. Most of the barrels in 7.62x39 measure. 310 in grooves and 300 on lands.
Bullets in surplus rounds and in modern ammo with difference of either over or under 4 thousands of inch will shoot the same. Pressure from gasses will swage or expand the bullet to the diameter of yor bore, and bullet will exit same diameter as your rifles muzzle that you are going to measure.
If your muzzle crown is sharp and properly cut then you have nothing to worry. Just try different brands of ammo and see what shoot best.
