Redding trim dies allow you to file trim your cases without unnecessary resizing because they are made to chamber dimensions. For case forming and necking brass down from another caliber, Redding trim dies can be the perfect intermediate step before full length resizing.
I own both 25-20 and 218 bee . There isn’t any brass available for them that I can find. It’s very easy to form from 32-20 and color code. Great product from outstanding vendor.