Newbie question don't laugh...
Can you use a cast bullet (boolit?) of .309 diameter for a .30-cal and patch it up to fit a 303 british which is a .311 (nominal, it would need slugged from what I've read) ??
Or does paper-patching not increase the daimeter that much ??
I'm confused on why people seem to paper-patch and then size afterwards. Also amazed the paper doesn't smear off or something...