I have read several posts about how hard it is to change primer sizes on a 650,I really don't see what is so hard about it.With the shell plate off take the 2 allen screws out ,lift the primer assm. off.Use a 1/8 inch allen take primer support shim off,remove primer disc,replace with one of proper size,replace shim and screw reinstall primer assm.Takes less than 5 minutes.I use this as an chance to clean any spilled powder out of machine. BILLG
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