This really don't make sense same as taking a bullet from a 30-30 shell and putting it in another 30-30 shell. I have both also .I know in the past ,there were those who wanted a heavier bullet to use in there .30-30 rifle ,who use to pull 190 bullets from .303 Savage ammunition and load them in the .30-30.
I guess back in the day, it was a way to get a heavier bullet to use in their .30-30.Perhaps back then ,303 Savage ammunition was easier to get than it is today.This really don't make sense same as taking a bullet from a 30-30 shell and putting it in another 30-30 shell. I have both also .