Bad Water Bill,
What did you conclude as to the best brass to convert to 20 Vartarg? At 1-Shot's suggestion I bought 1,000 pieces of WIN headstamp 222 Rem brass and converted it to 221 Fireball and then necked down to 20 Vartarg. Haven't fired any yet as I am waiting to get my mischambered barrel back from Shilen. I only lost four or five pieces during the conversion.
Charlie