I have an older Dillon 550 or 550B not sure which.  I have always used the Dillon for pistol.  Anyhow, I reload several different rifle calibers on a OLD single stage press.  I would like to use the Dillon as basically a single stage press.  My dilema is which caliber conversion kits do I really need.  I reload .223, .243, .260, .25-06, .270, and the WSM's.  I don't need powder dies as I will weigh and load my charges individually.  Most of the above listed cartridges use the same shell holder which is the .308 and the 30-06 family, the .223, and the WSM's family for single stage presses.