Next trip to the range will be with heaviest bullets in calibre to see, as you say, what they might have been thinking when they set this up. However, I'll also try a different powder to see if a different barrel time causes the muzzle flip to select a somewhat different POI for the 125g bullets tried previously. Something must gel sooner or later.

Gale force winds at present so not to best for a sight-in. Good time for reloading though.