You can use a Bonanza graphiter set for about $20.The set has 3 different size nylon brushes mounted vertically in a block they cover all calibers and the set comes with Mica powder that you put in the base block, then with the cover on shake it to put powder on the brushes then turn it the right way up and settle the powder back down in the base plate, remove the cover and away you go, just pass the case mouth over the right size brush and that's it.I do it after resizing and just before a powder charge, it works well.I'm guessing at the price,I'm in the UK and it's £23 but it comes from the US so you should be able to find it.