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Correctomundo Z13. The Dram Equivalent was meant to be the measure of black powder that was equal to what was in the shell. This number was an invalid number though due to several different things such as how fine the black powder was, the potency of the black powder etc. The fps is just a reference as to how fast the shot SHOULD go if it were three drams of black powder. Dram is not a measure of velocity but a measure of weight. You can actually google how many drams of black powder equals how many grains of smokeless powder. As one of these grey beards, I have misplaced the bookmark I had on this or I would have posted it here.
CB
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