Quoted: Corrosive ? ? ALL surplus com-bloc ammo is corrosive. This is "light ball" -- 150 grain steel core. Would like to try a few rounds thru my M-39  ! !

Like I actually need more LOL!
Crate coming, we should be able to share the range report next Sun at Tusco

PS_ From a Fortier article:

Externally comparing a 7N1 projectile to a standard ball projectile one finds both projectiles feature a copper washed steel jacket, but there the similarities end. The 7N1 projectile is slightly longer and features a more pronounced boattail with a noticeable hollow base. Cutting the projectile in half quickly reveals the 7N1 to be a well thought out sniper load. Sectioning it reveals an air pocket in the nose (similar to Sabelnikov's later 5.45x39mm 7N6). Below the airpocket is a 37.5 grain mild steel cone shaped core of .269 diameter and .520 in length. This sits on top of a 72.6 grain lead 'knocker'. These are pressed into the jacket leaving a hollow base with a depth of .100. Overall projectile length is 1.275 and diameter is .311. During flight, due to the air space in the nose, the projectile's center of gravity is toward it's rear. However, upon impact the lead knocker pushes the steel core forward into the airpocket and changes the weight distribution of the projectile. Thus destabilized, the projectile will yaw instead of simply punching a .30 caliber hole in someone. While not new, the British did something similar with their .303 British MK VII ball load prior to the First World War, this design is effective. This is an obvious attempt to increase the wounding potential of this FMJ projectile.