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Just a point:

The big, 1/4" diameter, copper-cupped primers in much .303 ammo are MERCURIC FULMINATE based and, of course loaded with a lot of Chlorate salts to ensure the flash penetrates the...

It depends on the loading, the factory and the vintage of the ammo.

If the .303 ammo has a .250", copper-coloured primer, it is mercuric AND corrosively primed AND, unless head stamped "Z", will...