Hornady Vectors, bright 124 grain (about 0.28 ounces or 8 grams) tracer bullets with a short burn range, low fire hazard, and muzzle velocity of 1000 feet per second. They were discontinued about 20 years ago, unfortunately. The pistol is a Beretta 92FS. It had rained- the grass was wet. Even if it hadn't rained, these bullets are relatively safe, burning only about half a second to a maximum range of about 150 yards, compared to military tracer ammunition which burns a lot longer and hotter.

The berm is about 130 yards from the muzzle. This clip was filmed with an iPhone 6 at 240 frames per second. The location is Livingston, Montana.