There is a lot of different powder measures, but I use one like this: http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0003249210263a&type=product&cm Cat=search&returnPage=search-results1.jsp&QueryText=powder+measure&N=48 87&Ntk=Products&Ntx=mode+matchall&Nty= 1&Ntt=powder+measure&noImage=0

The knob at the bottom loosens, allowing the inner plunger to drop down. It has measure marks on it, simply slide the graduation sliding "thingy" down to the desired measure and tighten and you are good to go. Then just pour from yourpowder horn/flaskinto the measure till it starts to run over, cut it with the swivel on the top, and you are ready to pour it into your gun.