Fire power is placing one bullet in the right place. I 303 that hits the brain will kill better that a 600 that misses it. I have shot buffalo and elephant with a 470 and got plenty of penetration. I have a 577 and a 500 but will take my 470 over both of them. Most people can't handle the weight and recoil of a 470. Why hinder yourself with a much heavier gun. I walked no almost ran for 5 hrs in 118 degree heat after buffalo this year. I surely didn't need 4 to 5 lbs more in my hand.

Sam