Steel Silhouette at 400 yds with Iron Sights

This is the real-time video of the abbreviated version that can be found here: • Steel Silhouette at 40...
I was shooting German surplus ammunition out of my PTR 91, GI model rifle. I got 20 hits out of 30 rounds fired. Half of all the misses were in one string at the beginning, as the spotter and I got left and right figured out. After that I went 18 for 23.
No optics or scope; iron sights (HK 1200 meter rear sight).