If you want the cat's meow, my understanding is http://dillonprecision.com/template/p.cfm?maj=70&min=0&dyn=1& is the one. But the little scale Cayugad mentioned is good 'nuff. I have one of those and a PACT II - would sooner use the little Frankford Arsenal model. It's handy and seems to be pretty accurate.

You do understand that anygiven grain volumetric charge will generally weigh less (sometimes considerably less depending upon powder involved)? 100 grains volumetric of Triple7 FFg will WEIGH ~80 grains. So determine your load weights byweighinga few volumetric charges of EACH powder first. Use an average of those volumetric weights as your target weight. Then be careful to note, when people are talking about charges, whetherthey are referring to true weight or volumetric equivalent.

Some guys can throw volumetric charges of their chosen powder that would be inside a grain or two for consistency. Others seem to have trouble keeping them inside a 5 grain spread. How much you gain in accuracy by weighing will be a variable, but you definitely will not be at any disadvantage by weighing.

One very important variable with charge performance is seating pressure. You should attempt to achieve the same seating pressure with every load. Hard to do by feel so you'll have to calibrate your arm.