Redding .223 competition seater.
I did exactly that for my 20 Bobcat.And FWIW, the sliding sleeve in the Redding Competition dies, NS and seating, aren't heat treated so if anyone ever has an "improved" version of something and Redding doesn't make the exact Comp Die you're looking for, you can have those sliding sleeves reamed to match whatever it is you had built.
This is what I use alsoHornady makes a value priced bullet cal specific universal seater (17, 20, 22, 6mm, 25 etc.) works just as well as any other I've used.