Well, I do know for sure that you can't make a 22-250 case out of a .223 case. The base diameters are totally different, not to mention the 22-250 uses a Large Rifle primer and the .223 uses a Small Rifle primer pocket. Making 7.62x54 brass from 45-70 cases? I do not know about that one. It might be possible, but you would have to mill the heads down at least. With the prices I see for 7.62x54 ammo, I don't know why anyone would want to form brass from 45-70 cases.
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