On a serious note, that target is proof positive that some people can shoot magnums very, very well.
Unless there are powder burns on it...
I'm not much for shooting groups, but I did try some powders and still came back to IMR-7228 and Nosler 180 grain BT bullets. These loads chrongraphed just over 3200 fps. When a gun shoots like this and has the ballistics that the 300 WBY brings to the table, I do feel strongly about how good an elk killer it is.
This group is just bringing the crosshairs over to where I want on paper, the rest of the proof is in pictures and my freezer...