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From:http://mcfg.tripod.com/shotshl1.htm"The weight of the shot pellets is given in ounces. The most common weight for trap is 1-1/8 ounce but 1 ounce of shot is sometimes used from the 16 yard line. The more weight, the more pellets are in the load, for the same size of pellet. 1 ounce loads will usually kick less than 1-1/8 ounce loads if the dram equivalent is the same. The dram-equivalent is a standard way of expressing the "power rating" of the shell. Modern smokeless powder is now used, but the dram-equivalent rating is the number of drams of blackpowder that the load is equivalent to. For a given weight of shot, a higher dram equivalent means a higher velocity, and more kick. 2-3/4 dram is ideal for the 16 yard line, and most shooters use 3 dram from the 25 yard line. Trap rules specify a maximum of 3 dram "So basically it gives you an idea of how much gunpowder you have..To shoot a heavier load at the same velocity as a lighter load a higher number of DRAMS is needed. Its not how well you shoot , its how much noise your gun makes
 
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