Now, I have an urge to do some 25-20 ala 32-20 although I haven't shot my 25-20s in years. So, tonight I tried the forming just using the 25-20 FL die and a little Imperial wax. Amazingly, I formed about thirty cases with only one having a small shoulder dimple. I annealed beforehand and worked the forming in about three slow stages.
Didn't RCBS or someone make conversion dies?