I have been searching for an ammo cross reference for all ammo. ie: 308 - 7.62X51. I need all caliber rifles. I am searching for ammo that will fit in many guns. I have a 30-30, 308, 30-06, 7.62X39, 243. Will 30-30 bullet fit in 308 and 30-06 cases? What powder would you suggest for high power rifles? Is there a site I can find all this information? Thanks everyone, yall have been so much help in the past.