The best blood trails begin with "L" - liver, lungs, or legs. A liver shot is awfully close to the paunch so it is hard to suggest though it may make an excellent blood trail. A leg shot will likely make a good blood trail - and long- but it may never become terminal. A solid lung shot will bleed well though perhaps be largely contained inside the ribcage. The best blood trails are short blood trails - which result when an animal is hit well- and will often produce a solid blood trail via the nose.
Shooting again is never something I've regretted when animals are large. It's much better to "admire the shot" when the animal is laying dead and you can see that number two was unnecessary.
.
,
