I spoke to the Barnes technician last week looking for the 110 grain TAC-TX on Midway and finding the 110 grain TTSX. The 110 grain 30 cal TAC-TX with the black tip is designed to expand down to about 1300 FPS (300 BO territory), the 110 grian TTSX is designed to expand down to about 2000 FPS. They are not the same bullet and I don't know where this internet rumor started.
for comparison Remington loads the 110 grain TSX in the 300BO as their so called Hog Hammer bullet, less expansion more penetration.
http://www.targetsportsusa.com/remi...-grain-barnes-tsx-ammunition-p-4118.aspx
