Unlike the video, I find the slapshot very difficult to use - air bubbles in the tube, and you have to get right up to the pig in the first place and get the needle in. On the other hand, I've found the masterject a godsend, especially for pigs that always keep a flight distance between you and them and rush off the moment you are seen to be approaching. Haven't found loading the syringe a problem, but always try and keep each dose 8 ml or lower, ie 2 jabs if they need more than this. If there is too much liquid in the syringe it is a big problem getting it all through the narrow needle in one blast, even with a 14 gauge. [size=78%] [/size]