I have always been fascinated with high speed photography, especially when it’s a photo of something being shot.
30 Colorful Shots Of High Speed Bullet Photography
In quite a few of these pictures the bullet appears to be a pellet, which means that the gun used would have been an air rifle. According to wikipedia the average air gun fires the projectile at less than 1000 ft/sec (300 m/s) which means that you wouldn’t need very expensive hardware to capture pictures like this.