Thanks! I can turn the necks if need beVery hard to find.
You can make it from 221 Fireball brass.
Run it into your seating die with the stem removed. That will take it to 18 or 19 caliber.
Once you do that, one pass through the sizer and you have a 17 Fireball.
Check loaded round neck diameter. It should be good if you have a factory chamber.
That Bullberry die is great. You won't need to bother with the seater die for forming.I bought a forming die from Bullberry barrel works. It’s a two step die. Run the case in one end and turn it over and run it in the other end. Thanks for the advice on the seater die