Your rifle has had the barrel replaced at least once by the Germanicon military . No 88/05 rifles ever had a "small" CZ barrel . Your bore will be at least .311 - .321 . Slug it to know for sure . That barrel was never made to shoot the heavy bullet Ss ammo , just old P-88 or 154 S ammo [ same as Turk ] . The rifle is very old now so you may want to be easy on it . The Romanian surplus is ok , also any US loaded ammo .