Interesting point. I have never heard Kimbers being referred to as "tack drivers." However, to be fair, it is understood that, generally speaking, the lighter the gun, the less accurate it is. As many of us know, all else being equal, added weight assists in achieving better accuracy. Kimbers have very thin barrels, which in turn means that they are light. Then again, when you combine the smaller portions of the rest of the gun, we can see how shaving a little bit here and there can decrease a gun's total weight by a noticeable amount.
So when I bought my Kimber, I wasn't expecting 1/2" groups like I do with my other standard weight rifles. I viewed it as a trade off. If I go hunting for elk up in the mountains of Utah, Colorado, etc. (God willing), I KNOW that I'm going to be doing a lot of walking and hiking up at those high altitudes. And from what everyone tells me, after a while, every ounce counts. While I don't necessarily take that literally - ie, I can't tell the difference between an ounce in a gun - I get their point. So my trade off was that I, who am well known as being an accuracy freak, would be willing to sacrifice A LITTLE accuracy for a light gun. Notice I said A LITTLE. I can live with 1" group with the Noslers, and even 1 1/4 or so with the Barnes. At 300 yards (my self imposed maximum limit with this gun and load on game as big as elk) my groups should not be bigger than 4". Now remember that we are talking about 4" at 300 yards and at an animal that has a vital size about 2 times that of a whitetail deer. So, under such circumstances, I am happy with the trade off of the Kimber.
On a different note, I have heard from a couple reputable sources (friends of mine) and several questionable sources (i.e. people on the internet), that the Remington Titanium, while also a very light rifle like the Kimber, generally produces noticeably worse accuracy. My friends who have them have averaged a little over 2" at 100, and that's the best groups with favorable ammo. Now I would imagine that someone out there may jump in and say that his/her Remington Titanium shoots half inch groups. Well, that's great, although from what I have heard, certainly not the norm.
Again, the point is, while light rifles can sometimes be just as accurate as their heavier counterparts, they generally are not. As such, I view it as a trade off...a balancing test if you will. If a gun is much lighter, I am willing to give up a little less accuracy.
Zachary