Can the same bullet be loaded in a 22-250 and .223? Is the brass of a 22-250 larger or smaller?
The 22-250 is definitly a larger round. According to
Haas' Guide to Small Arms Ammunition, the brass of a .223 is 1.76" long, and has a .378" diameter at the base. The brass for the .22-250 is 1.912" long and has a .473" diameter at the base.
I'm uncertain if the same bullet can be used for both. I'm pretty sure the diamter of the bullet is the same, but don't know about the other dimensions and weights.