I do it the following way:

- Cast the bullets

- drop them in a plastic container with a few tablespoons of powder

- close the lid, swirl till I get tired of swirling, maybe 30 seconds

- dump the bullets out on a wire screen over another plastic container to let the excess powder drop off and be reused

- dump the bullets on parchment paper and put in the toaster oven at 400 degrees for 10 min (you will need a separate oven for this, don't use an oven you cook food with)

- size the bullets after powder coating

There are different ways I have read people do it but they all follow the basic method.

One thing I have read that is consistent is to use a plastic container to swirl that has the triangle with the "5" inside of. It apparently denotes a type of plastic that generates the required static.

The RAL powders from Powder by the Pound are what I used. There are multiple colors to pick from.