Your results mirror my less rigorous testing. I have a MkIIGL (sporter weight blued barrel, hardwood stock) and a MkIIBTVLS (heavy stainless barrel, laminated thumbhole stock). I free floated the GL and the BTVLS came that way out of the box. Both have Accutriggers set at about 2.5 pounds. All of my testing is from solid sand bag rests on a sturdy bench.
The heavy barrel significantly out groups the sporter with all brands and types of ammo I have tried. The GL tends to throw about one "flyer" from each 5-shot group, not wildly out of the group but enough to make a difference. The heavy barrel gun shoots much tighter, more "symetrical" groups.
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