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.

https://bigborefan.wordpress.com/2014/02/06/why-the-458-winchester-magnum-is-enough-part-1/

https://bigborefan.wordpress.com/2010/08/28/the-battle-of-the-big-bores-the-458-win-mag-advantage/