I acquired a Lee posi-prime hand press and a Lyman 310 handle. Can not figure out what letter holders I need for various cartridges. Can anyone provide a conversion list/chart for all the different letter sizes to caliber? These holders thread into the tool.
Then I have this 310 handle/no dies, I believe it is the small size. It came with an H size insert/sleeve. Any idea which caliber(s) use the H size?