Glad this is a theoretical question. Really would have to just have to choose just one. But probably a Ruger 10/22. Quiet enough, and can carry alot of ammo. Been told, really don't know this for a fact, but Velocitor ammo for a .22 can bring down a deer, with good shot placement.(head shot) Plus, extended mags give extra firepower. Don't think I'd have much confidence on human size targets past 100 yds., but would make somebody think twice about getting any closer. gypsyman