A | Your uncle iscorrect that the Dr.Eq. markings on those old shotshell boxes are an indicationof the power of the shells originally contained therein. Dr.Eq., sometimesrepresented as "Drm.Eqv.," or in other similar ways, is an abbreviationfor "dram equivalent." This figure represents the relative velocity ofthe shotshell (loaded with smokeless propellant, which cannot be measured indrams) equivalent to the velocity achieved from a charge of black powder ofthat weight in drams. For instance, a 12-gauge, 2¾ inch, 1 1/8-ounce loadtraveling 1,200 feet per second is a 3 dram equivalent load.