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"...Does not say the cal..." Measure the bullet diameter.
Brit rimmed cartridges were called 'flanged'. Shoulder angle is right for a .300 H&H Flanged NE(aka Super 30 Magnum) though. A 7mm H&H or Rigby, maybe.
There are drawings of Bertram cartridges here. Nothing about a Commemorative, of course. http://www.henrykrank.com/bertram.html
