20 ga. shellholder

I have the RCBS 12 ga die set. It has a shell holder that allows me to use my bench primer for brass shotshells. I have been give some 20 ga brass shells. Do any of you know where I can get a shell holder like the RCBS one for 20 ga. While I am at it I probably should get one for .410 as this brass shell infection seems to be spreading.

I would call ch4d.com and ask. They make a bewildering number of odd shellholders, maybe an in stock one would fit.

CH4D makes them. As to being in stock???