Well for actuall shooting pratice i usually do this when prating with my bow. Get an 1 liter bottle or milk container, whatever is more or the less the size of a squirrel. set it up in grass (or dirt bankment if shooting gun) at whatever range. Sometimes i putt dirt inside the bottle so it has the same color of an squrriel. Try open sights and scopes. I like shooting squrriels with scope personaly.