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The four modern rounds are (from left to right): 30x173 GAU-8 (API loading for A-10); 30 x 170 Oerlikon KCB (formerly HS 831); 25 x 173/181 Oerlikon KBB; 27 x 145B Mauser BK 27.
I don't have a clue as to what the 35mm case is for - case length and rim diameter are needed!
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