Thread: Fire forming 270 to 280ai

It’s easier starting with 2506 brass, as the shoulder & neck length are closer to 280ai. You can use 270 cases but there’s a lot of trimming to do on the neck to reduce back for correct COL. When I’ve done it I’ve run them thru a 280 neck size die, trimmed to SAAMI COL then fire formed. Hornady do a universal 7mm neck die.