I picked up a nice M48 Mauser in 8x57 , I had no brass for it, so I ran some Hornady once fired 30-06 brass through the 8x57 full length die.
After I resized the 30-06 brass I trimmed the extra long neck with a tube cutter and finished the brass off with the 8x57 case length gauge.
I tried all of the reformed brass in the rifle and they fit perfectly, I loaded them with 195 Hornady Interlocks, a range trip is needed now.