I believe BudWhite has it correct about the ego round...but it's good that we have choices as what caliber to carry. Sorta like a friend of mine that I hunt with, he uses a .284 Win. lever action he inherited. He has had difficulty obtaining ammunition for it and when he did, it was rather expensive. It is an effective cartridge, but when was the last time you heard of that caliber? In IMHO, I believe I'll stay with an effective caliber that's readily available now and for awhile to come.