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Sunray, thanks for finding a picture of my cartridge, the head stamp reads SUPER-X 300 H&H MAG. Keep in mind the case is aluminum and
the bullet is plastic not a normal copper jacket.

Any...

I have had this cartridge for a long time and decided to try and identify this loading. The cartridge has the normal 300 H&H profile and headstamp - but the case appears to be aluminum with some...