Gary,
To form cases I run a 25-20SS case into the Maximum size die,
prime the case,load it with 4 grains of Bullseye,fill the case with filler(I use grits),top with a TP plug and fire in the rifle. I have not found it necessary to anneal.
Then neck size with the 222 sizs die and load.
All you need to do is neck the the 25-20 case enough to chamber in your rife to do the fire forming.
This might save you some steps and and give you some cases to try.
Best wishes,
Bill
Last edited by WaddieBill; 05/01/13 04:29 PM. Reason: correction