These are the steps I take making 9.3 x 57 from 30/06
Aneal the 30/06 case neck and shoulder with a propane torch
cut the 30 /06 case using a Lee Case trimmer shell holder in a drill press and a 32 tooth hacksaw blade.
the Drill press is set so that the case cuts at 58 MM with a 3/4" hardwood block resting on the drill press table and the saw blade setting on top the 3/4" block
Campher the inside/outside of the case with an RCBS campher tool
Lube the inside case neck with RCBS spray lube sprayed into the case lube can cap and a Q tip
Put the cases in a ZIplock bag and spray with case lube.
Run through the 9.3 x 57 size die.
Time to 2.224"
Campher inside and outside of case neck
Tumble to clean cases,
Prime and load.