But on the other hand, any weapon is practical when you need a weapon. Another reason I think a bolt action rifle would be somewhat ideal is the lack of moving parts. Basically, there's the bolt and trigger. On a semi-auto there's a lot more that can get worn out, and everything should be oiled and clean more than a bolt action I would think. And it also depends on the circumstances. If we were talkin hurricane, and things get bad, but will be back to normal, then yes a semi-auto carbine would be fine and a Mosin may not be a great choice. But if we are talkin "28 Days Later" and there's zombies and no hope of the government saving you then I would think a bolt action would be good for its relative simplicity.