I make my own roughing die in my lathe.
It's specially made for the task of roughing.
Here it's capable of taking a crusty old 270 Win to 8.6 Blackout in one pass, one second to form, Without lube, but the brsss gets hot, forming so a light spray with Hornady One Shot, is all that's needed.
No dented shoulders, just perfect shoulders every time and fast.
Trim to length in mill/ collet setup, very fast trim time one second.
Use a Lee FL die to form.
Neck turn in lathe with ground carbide 30° angle tool, with sharp 5 to 8° radius on neck/ shoulder junction to eliminate donuts.
Anneal
Resize in Lee FL die, then check shoulder bump, this gauge is 510 Whisper, gauge made with reamer...on a micro flat with
drop indicator...but ypu get the idea.
Even hybrid cases 6.8X 51 formed to 8.6 Blackout, for extra velocity for bolt guns, and supers. If ya like 2800 fps for 160 gr Barnes, or 2000 fps for 300 gr Berger Match bullet....to go with your brass cased subs.
Any brass case can be formed from a larger case. The closer the better, but one can almost never run out of brass cases.
Some are more difficult, even requiring an extractor cut to be made. Like 308 to 6 mm ARC, or 308 to 6mm Dasher, etc.