Around these parts(Continental U.S.) Sparrows are Rarily alone,Including English Sparrows,That said,10 Sparrows would provide a meal!Just about any BB-gun will do,& Since we happen to be on this side of the pond,No Worries as per-psi for the BB/Pellet gun!I had a Red-Ryder as a kid,& though my Karma suffered,Almost everything I Tagged,Most certainly Did Not,On some occasions,such as Blue Jays/Brown Birds,a 2nd shot did the trick!Now apply that to survival,& One should not go Hungry,for long,Of course that also depends on Where You'll be doing your survival! Anywhere in Michigan,short of Severe Weather/Squalls,You would be Good to Go!Don't forget that back-up fishing kit,&Good Luck!