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Bit of a bugger, I brought 200 a year or so ago with the hopes primarily of using the brass after firing. Might not get much life out of them!
Also might have to buy a .303 broken shell extractor...

That's bad! I've got some loaded stuff which is tarnished but haven't found any pitting.
Have had to pull a few for a few issues. Clumped powder, loose projectile etc.
Definitely don't shoot it...