I tamed him today, just aim for the head with tranq darts or arrows, make sure no brontos are close, my bronto was lvl 1 when i found him and tamed him, while lvl 1 i killed a good level trike with 2 hits brontos are also very good berry gatherers. Also while talking abt bronto type dinos, i tamed a diplodocus in thoughts of it having an attack, i got dissapointed when i saw that he can only push away, like bro, my bronto and ankylo yeet you out of the atmosphere while dealing TONS OF DMG