... the classic Elmer load , the one that paved the way for the .44 Mag is 18.5grs of 2400 , a 250gr hard-cast 'Keith-style' SWC in 44 Special cases.
Not always. Elmer's loads in the .44 Special varied according to
which kind of .44 Special cases he was loading. There were three kinds in those days:
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folded-head � roomiest of the three but also the weakest (long obsolete now, and relatively rare)
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balloon-head � less capacity than the folded-head but stronger, but not as strong as the solid-head (obsolete and likewise seldom seen now)
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solid-head � least roomy of the three but the strongest