I don't use them because the deck height of the holder is taller than normal. To use you need a sizing die that is a little short to allow for the taller deck. To use you need to setup with a + marking to allow you to go shorter. I find it's easier to use a std and anneal the brass when it gets hard to size due to spring back. Most of the sizing dies I have from Redding normally do not require making contact with the shell holder to size the brass.