Bleeding Shot 3 (Source)

It's really hard to test bleeds at this time because there isn't anyway to tell if the target is Bleeding Action, Health or Mind just by looking at their status icons. But the easiest way to test it (doubt you have the time in earnest combat, though), is to use BleedShot, and wait for the tick. If the damage numbers above the target's head when the bleed ticks are red, then it's hit health; if they're green, action; if they're blue, mind. That's really the only way I know of.

Fire BleedShot three times, and all three stick to different pools, when they tick you'll see three different numbers above the target's head. If you fire BleedShot three times, get a Health Bleed first, then an Action Bleed second, and a Mind Bleed third, the Mind won't override the other two, the target will suffer three bleeds.