I really enjoy hunting blue wildebeest and have shot many over the years with rifles from .308 to .375. taken quite a couple with my bow as well and found them to be easier with the bow as they present a large kill zone and are not skittish (prone to string jump). The biggest mistake new hunters of this species make is to aim for the center of the body, behind the front leg. the leads to shooting to high as the animal has a high shoulder (hump) and a deep chest (brisket). as far as frontal shots, although the bwb has a long face, there is more than enough chest area below to aim at and normally it will lift its head while looking directly at you. you can clearly see the shoulder bones (Afrikaans: "knoppe"), just aim at bottom of these, center chest and viola! 100m or so and you have a pretty picture of one of Africa's icons. The inquisitive nature of the bwb makes them easier to approach than most other African game as they will normally give you a chance. they definitely cant count, so if you and your hunting party (PH, tracker, Cameraman, gun bearer, etc....) cross paths with a herd, walk away at 45 degree angle with the hunter and PH kneeled down. the herd will normally follow the people walking away with there heads and you have a possible shot at the big bull. However, if you spook them, they can be quite difficult to approach as they keep watching there tracks and normally see your approach long before you spotted them, all you hear is that annoying snort and departing hooves....
Happy hunting, shoot straight and trust your ammo and your gun...