For those who haven't read this I hope you find it informative. It is a practical argument and does not allow for the nostalgic factor or the " mine is bigger than yours" factor. Please keep in mind that it is legal in most countries to hunt with a .50 BMG cartridge with soft point bullets or solids made for dangerous game and that's considerably bigger than a .505 Gibbs. The second site is for those interested in the.458 Win Mag.