I shoot a Weatherby Vanguard .30-06 right now and am happy with it, when I pick up a .22-250 it will be either another Vanguard or a Savage.
We all know how picky rifles can be about different loads, even in guns that are the same make, model, and caliber can shoot well with one and not as accurately with another.
The part that is misleading about this poll is the fact that most of us haven't shot a wide range of rifles back to back, and while this group of shooters is more demanding than most when it comes to accuracy, I think that the majority of us stop when we are happy with the accuracy of our rifle compared to our skills.
What I mean is if I go out and buy a new rifle, I am likely to try 3 or 4 loads in it, and if I am happy with the best one, that is where I will stop and what I will shoot. I know some do try every combination of cases, primers, powders and so on, but unless you can't get acceptable accuracy, I doubt many of us are really pushing the envelope of our rifles because it is usually our skills that hold us back as long as the gun is capable.
It would be very interesting to have a large get together in an area where the most of our members live. Have everyone bring out their rifles along with a couple boxes of ammunition, and mix things up. Try everyone's loads in your rifle, see of others can achieve better accuracy with your rifle than you can, and see if there are any common trends.
I know this probably wasn't very helpful to the poll, so sorry