Ok, how about this: I spent some time sighting my 16" in today, and I'm close. I think I'm doing something wrong, so I'd like to run this past the group to see if I'm the part of the system that's at fault.
At 50 yards my point of impact is 1.5" left and about .75" low. My sight picture is a "lollypop" with the center of the target (it's a small one, about 2.5" in diameter) firmly on top of the front sight post. I'm using the long-range aperture. My focus is on the front sight post, and as far as I can tell I have equal amounts of space on either side, and top to bottom.
I have noted that my trigger finger wraps around the trigger a little more than it should, but it doesn't seem to make a big difference; when I pay close attention to that, I don't see my groups moving substantially in any direction.
I'm using a benchrest front rest with a small saddle-shaped bag on it, and no rear rest.
Am I missing something in the above? Do I need a better fromt rest, or a particular kind of rear rest?