"But is there any other caliber that could be shot thru the 300 savage?"
My short and long answers were intended to be blanket answers covering all parts of your question.
Look, high-intensity rifle cartriges aren't a case of "well, it's close enough, so it will probably work."
There are a number of cartridges that will either easily, or with some force, fit in to a .300 chamber.
ONLY A FOOL WOULD DO THAT.
Chambering and firing the wrong cartridge can, in certain situations, lead to severe damage to your firearm, severe injury to yourself, or even death.
Leave your .300 on the shelf until such time that you find the proper cartridges.