In my experience both monolithic hunting bullets (such as Barnes, Hornady GMX, Nosler E-Tip, etc.) and many of today's high-BC lead-cores (NOT just Bergers) often shoot MUCH better when seated deeper. Have seen groups shrink by up to 75% when seating the same bullet up to .1 inch deeper, sometimes even more, when using the same powder charge.
I agree on some rifles this is absolutely the case, but then there are others..............
My 300WM steadfastly refuses to shoot any bullet that is not touching the lands, my current load is Berger 210gr VLD .010" jammed
I also have a 22-250AI that shoots the 80gr Berger with a .010" jam
