I didn't read the whole thread but the first forming of cases came with a recent project. I've always wanted a 250 Savage. Buying a new rifle has become impossible, so I built one. Bought a savage Model 11 and screwed a 250 Savage barrel from midway into it.
Searched for weeks online and every local shop I could find and finally found a box of factory loads. Finding brass was even harder. I searched and found two options Necking up 22-250 or necking down 6.5 Creedmore.
Tried both. Works fine.
Leo