I have a wildcat suggestion for Overkill.

This will be a 1 bore wildcat. Cast bullets for it will weigh 3200 grains. The bullets can have hollow points if you want.

530 grains of Reloader 22 will be used to push the bullet at 1500 fps.

Cases can be made rimmed for a double rifle or rimless for a bolt action magazine feed.

Unfortunately only 4 rounds of ammo take up the 11 pounds of ammo limit for airline travel.

thats why you bring 2 friends so now you can have 12 rounds

I forgot to mention that the primer will be a blasting cap.