I watched that Hickok video and was a bit worried about the 220's in my gun but I had already bought a few boxes so decided to see how well they would shoot. I shot the Underwood loaded 220 at 100 yards and there was no evidence of keyholing on the target. Underwood bullets have a coating, Hytek or something like that, wonder if that helps accuracy in the factory barrel? So far so good with the Underwood 220's for me, no malfunctions, good accuracy and the bullets kill wild hogs like you hit them between the eyes with a three pound hammer. The 200 gr. XTP has been a good killer from my G20. It is a bit more accurate in my gun than the hardcast. It works well on deer and hogs.
If tge 220 is marginally stabilized then it will tumble in test media and animals. Wet print or ballistics gel will show if it is fully stabile
