Both photos show a fairly high round count which, if fired over a short period could account for some of that dispersion. If fired unrested, fatigue could also contribute to spread.
I prefer to sight in from sand bags, then from sitting and off hand on the chance the recoil from the shoulder differs enough from the sand bags to require compensation. For the deer and elk rifle, I also try to insure that first shots from cold barrels are where I want them and that fast follow up second and third shots are near enough (a process that can make for long range sessions.) I care little if a ten shot rapid fire group blossoms if the first two or three are tight. (So far, my rifles open up only slightly with extended fire.) When I finally buy the heavy varminter I lust for, it will be expected to stay reasonably tight from cold to hot.