Only one for everything? So for your buck and pig to rhino and elephant? That then to me must be a round that can be loaded up and down.....

A tricky one but ok for modern a .500 nitro and for old a .577 express i guess.

If only one and expected to hunt the world over then a cape instead please!!! How much rabbit is left after being hit with a heavy game round??? How much pigeon?

Ben