I've done that too. I had a .311 groove diameter barrel on the Krag I used. They were 173gr Russian steel jacketed bullets from Wolf Military Classic .303 British Ammo, the stuff with the delay fire primers. In the end I wound up pulling the bullets, dropping the powder charge a couple grains, and loading them in Krag cases. They shot pretty good, I still have many of the loads. If someone starts importing Berdan primers again, I might have a use for the Bi-metal .303 cases one day.
"I have sworn upon the Altar of God, eternity hostility upon all forms of tyranny over the minds of man." - Thomas Jefferson