I purchased some of the Iranian surplus 8mm Mauser ammo a few days ago. I am sure some of you have seen this stuff for sale.
In firing 20 rounds, 3 did not fire at all. I even attempted to fire the rounds a second time with the same result. 4 of the rounds were hangfires lasting 1/2 - 1 second. The remaining rounds all fired, however the group measured 7" @ 25yds.
Rifle was a VZ 24 that I normally get 2" groups at 50 - 75 yards.
Lucky for me I did not pay that much for the ammo.