[Unclenick]

One word of advice: don't use desiccants for powder storage. Lowering the moisture content of powder raises its burn rate. Norma has a bunch of plots in their print manual showing a 110-12% difference in burn rate, going from 80% humidity to near 0%. You want the relative humidity level at which your powder maker stores and ships stock for the load data they publish to remain valid. Norma also showed that loaded cartridges will equilibrate on the inside with the relative humidity on the outside over about a year, so you don't want desiccant with your loaded round, either.

You can get a digital humidity control on eBay for less than $30. If you have a lot of humidity in your storage locations, wet it up to control a Golden Rod or similar heater inside your storage container. Put it in with your stored stock and give it a circulation path (or use a small computer fan) and you will have controlled relative humidity.