I'd suggest kiting it to your base and tranq'n it with an anky or dino with high health that you can shoot off to make for an easy solo tame.Get that raptor kibble and bam you got yourself a snuffalufagus. Your welcome
On the raft build a 3x3 foundation with 3 walls high and a ramp going up into the raft. Go to the winter area youll find Mammoths there. Get it into the raft. Once in the raft shoot it with tranq arrows. Starve it and then feed. Kibble is 80times its food.