Quote:
Not really.
Head diameter on the .303 Savage is .442.
Head diameter on the .3030 family of cartridges is .422.
.02 is getting to the point where you don't really want to try it.
A better route is to head swage .3040 Krag cases.

I stand corrected!
I know they are about the same power but, never having had either one (.3030 or .303), I always assumed they were of similar general dimensions.
After looking up the pertinent data in my cartridge book, I see that .3030 is .422, and .303 is .439, a difference of almost .02"