I know this, because I did it.
Obviously, the cartridge would have to be accurate, good on game animals, varmints and human adversaries.
You'd have to be able to easily handload it, find bullets, primers, powders and loading journals anywhere--perhaps anywhere in the world.
It would have to have knock-down power both up close, and at a fair distance. To do so, it would have to shoot flat, and also find its way through a tangle of branches by a careful placement through a good scope.
The bullets would have to have a wide profile, from rapid expansion, to target bullets, out to heavy 'grand slam' style slugs.
And yet, in so doing, the rifle needed for this cartridge would have to be capable of being fired by men, women and children.
It would also be nice if every manufacturer made a style, or styles, of the rifle needed for the various needs and wants of the customer base.
For those reasons, I chose--and choose--the 7mm08.