Double ?

[Mike H]

Have some ammo, can,t find any info to ID. First is 5.56x45. Circle with cross at 10 o'clock. 93 at 2 o'clock. RORG AT 6 o'clock. Second 79 at 12o'clock-stars at 9 and 3. 7.62x51 below the stars. 7.62 has pinged in place primer. Is this corrosive? Any info on either one? Thanks in advance. mike

[Tuna]

The 5.56 marked RORG was made by the Royal Ordnance Factory Radway Green UK to NATO (cross in a circle) specs in 1993 and is non corrosive. I cannot tell you anything on the 7.62 other then it may have been made in 1979.