TSXs have been raping sectional density worshippers for years, due to good bullet design.
I beg to differ! A ttx with a sectional density of .320 traveling at 2800 fps will penetrate much further than a TTX with a sectional density of .225 traveling at 2800 fps both bullets weighing 180 grains.
In fact, the ttx is an excellent example of expressing the usefulness of high sectional density
Trystan