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High Base/Low Brass & Low Base/High Brass was from the early days with paper hulls and Black Powder. If the top of the baseewad and the top of the brass were the same point, sometimes hull burn-through happened. The Low Base hulls had more room (heavy loads) and used High Brass. That's cerried through to today, even though there isn't any rationale for it any longer (except the perception that High Brass = High Power).
DC
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