I haven't tried TTSXs yet. I have tried them in factory loads with okay results. They get great reviews and have a good following. I will look for the earlier post. It makes sense that they would be more accurate. The less-dense copper will produce a longer bullet given the same bullet weight. The longer bullet should be more stable.
I agree with you on getting these lightweight rifles to shoot accurately. A light trigger becomes very important and how the rifle is held seems to make a big difference. It is all a trade off. I used to carry a 10.5 pound Sendero up the mountain, but I also remember heading back to camp early due to fatigue.
