Treating foot rot with a dart gun

We have had the dart gun for about 5 years now. Its a big time saver making treating pinkeye and foot rot much easier. Its alot easier on the cattle durning these hot days. You dont have to stress the whole group and one guy can do it all with no help. The syringes hold 20cc's of whatever you want to put in them, had long penicillin in this one.
The dart in this video fell of right after I shut the video off. Its kinda hard to shoot the gun, hold the extra darts, drive the 4wheeler and shoot the video all at same time.....