303 british ammo question

I'd want to know how old it is and if it's loaded with cordite, also if it has noncorrosive primers. I would assume that it will be Berdan primed. As you may already know, cordite erodes rifle bores relatively quickly compared to modern conventional smokeless powders. No big deal if the primers are corrosive; just clean the gun with a water-based solvent initially, then clean as normal.

I got some WWII-vintage Kynoch ammo from Sportsman's Guide several years ago. It's about 25-35% duds.
 
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