Just to mix it up, how about a combo shotgun-rifle, or a multi-barrel system? Here are a few sites at which to look.

http://www.savagearms.com/24f12.htm

http://www.remington.com/products/firearms/combination_shotgun-Rifle/SPR94.asp

European American Armory has added a new combination rimfire rifle/.410 gauge shotgun to its line of quality affordable Baikal firearms. The Model IZH94 features a rimfire upper rifle chambered in either .22LR or .22WMR and a lower .410 gauge lower shotgun. Key features include hammer forged chrome-lined barrels, checkered polished walnut stock and forend, machined steel receiver and monoblock, extractors, screw chokes, iron sights and 11 mm scope rail. Contact European American Armory, P.O. Box 1299, Sharpes, FL 32959, telephone: (321) 639-4842, fax: (321) 639-7006, Web site: www.eaacorp.com.

http://www.predatormastersforums.com/baikal.html


Switchable barrels

http://www.rossiusa.com/products/product-details.cfm?model=S2022243RS&category=MATCHEDSET

In a survival situation: single shot reliability and ease of maintenance, redundancy, choice of ammunition to carry and use, increased ability to use foraged ammo, in-the-field flexibility, etc.

Get more than one to cover various caliber options in a couple of weapons?