The high velocity bullets can be fouling you if you don't practise a lot.

Before I went to Africa I was practising a lot on moving targets both with my .300 but mostly with my 6,5x55.

When I shot my Warthog I took 4 shots at it running and none gave results as I was certain it would. After he had turned 180 degrees around and stopped I took him standing.

Confused over not hitting him with a running shot we moved to him and on his forehead he had signs from a bullet touching. That must have been whats turned him around. What I did was to aim a little bit to much in front of the hog, if I had been using the 300 fps slower 6,5x55 he would have dropped from a perfct shot but a I did not compensate for the higher spped I was close to lose him.