I had a request to post this - I stumbled upon this method for holding .30 cal gas checked boolits while you powder coat. The gas check shank will fit "perfectly" into a 1/4" fender washer holding the boolit upright and steady and then pops right out after PCing and keeps the powder coat off the shank for easy gas check install. The added bonus of using 1" washers is it evenly spaces the boolits making an even coat of powder simpler to get.
Here a picture of the box of fender washers and a before and after...
Hope this helps!