Curl,

I have just recently formed 50 rounds of new Hornady .303 brass to .256 Mannlicher. They formed perfectly with no losses. I form by first trimming to length then run in a .308 FL die, then a 7x57 FL die and then in the 6.5 FL die. Then I do a final trim as the cases grow in length during forming. Loaded rounds chamber freely in three M92's a Lancaster, a Pape and a Jeffery.

Best wishes