I managed to form .222 Rem from .223 /5.56 brass without too much problem; so I decided I'd make some .22-250 brass from .308 Win. Well, surprise, surprise, surprise! It looks like it takes more than just a file trim die for the .22-250. In fact, after reading the related posts here I realized RCBS makes a die set to make the brass from .308 or 06 brass which is quite expensive and well beyond my needs anyway. Here is my question. Can .22-250 brass be made from .308 using dies such as the 7 -08 and .250 Savage to bring the shoulder back and neck down in a series of stages? Has anyone done this with any degree of success? I see a huge amount of time could be tied up in this; I'm just trying to see if it can be done at all. I wound up placing a .308 case in the rockchunker and turning the file trim die in 1/8 turn increments and sizing at each increment to bring the neck and shoulder down and back and still ruined about 50% of the cases by having the neck collapse. Was an eye-opening experience...