As I mentioned in this thread earlier...my Mosin Nagant was piercing the primers. I checked firing pin protrusion and it was minimal so I knew it had to be the ammo since no other surplus I had used was doing this. I pulled the powder and it was at the correct weight...50 grains. Since this Czech ammo is designed to be used in cooler weather than here in CA (was 98-105 degrees when this was happening) I simply experimented by backing off two grains at a time until the the problem stopped. It stopped at 44 grains.
I later took some of this same ammo to Virginia with me to a buddys place and shot it in the Fall of 2005...firing it with the full charge of 50 grains...weather was in the low-70's...no primer piercing.
I later took some of this same ammo to Virginia with me to a buddys place and shot it in the Fall of 2005...firing it with the full charge of 50 grains...weather was in the low-70's...no primer piercing.