While researching the history of Mesko (Poland) I came across these short range “anti ricochet” cartridges in 9x18 Mak. and 9x19 Para.
In opposite to the known 7.62x39, 7.62x51 and 7.62x54R with black (and some with white) plastic cores these here seem to have aluminum cores or at least parts are aluminum.
Anybody out there who can elaborate on the inner construction of these?
Projectile: 3.5 gram
V10: 400 m/s
Pmax: 137 bar
Projectile: 4.4 gram
V10: 540 m/s
Pmax: 260 bar