I personally was trying to hone in the harmonic dampener by starting with it screwed all the way in and then unscrewing it a 1/2 turn after each 5 shot group, like the gentleman in the video, in order to set the dampner location. I only shot a few groups before I ran out of day light. As such, I didn't finish setting the dampener. However, I was shooting from the prone position while resting the rifle on a bag. One of my shot groups (5 rounds) was within 1" at 100 yards. As you can see in the video, this guy shoots 3 round groups from a bench rest, but has many single hole goupings on his target at 100 yards. This rifle is "extrememly accurate"!