303 Ammo

[Black Jack]

Thanks in advance for the help. I have the chance to buy 100 rounds of .303 (for $90 USD)with the headstamp R (broad arrow) L 7 45. From what I could find it is 1945 Royal labratory Woolwich, Mark 7 ammo. It is it cordite, and corrosive, corrosive, or just nitro non corrosive? There is another 7 or L I am betting on 7. Thanks again for the help.

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