I don’t understand how someone would even try this shot. The odds are great that he would miss, and missing at that distance pretty much means you have no idea wtf it’s going to hit.
Technically speaking, I was intrigued by the story in the OP which says that of the five longest-range snipings, three were done by Canadians. I had to look into this, and I’ll offer my thoughts.
I just spent an hour researching heavy sniper weapons, since a couple of decades have passed since I last did so. Sniper weaponry is a damn GROWTH industry around the world, it appears.
Mostly the difference between US and Canadian sniping is in the equipment, not the training. And mostly the difference in equipment is about military procurement practices.
Canadians are interested in technology and results. The Pentagon is interested in tradition and “good old boy network” bullshit.
However, while the McMillan TAC-50, built for Canada in the US, is in fact the standard Canadian heavy sniper rifle and is credited in the article for this impressive record-setting kill, neither of the rifles in the photo are TAC-50s. They both appear to be some sort of semi-auto squad sniper weapons from PDW of Canada, probably in the smaller but very good .338 Lapua magnum.