Recoil tolerance dictates cartridge. If I can't shoot it like a varmint rifle, it's too much. But don't believe in "overkill". Cartridge must be appropriate for the game, and capable of producing two leaky holes somewhat reliably.

No, I'll never hunt pachyderms.

Decent ergos, but most have them. Not picky about it. Can get used to whatever I practice with.

Good/very good trigger - some have it, if not, it's fixable. Must.

Stainless or otherwise weather impervious. Synthetic or laminate stock, and "typical" stocks are fine. Anything else is a safe-queen.