As I mentioned before, the heavier bullets USED to be needed, because they shed a lot of weight as they go. But penetration is all about retained mass, and the monolithic bullets, like the Barnes TSX, Nosler Etip, and the Hornady GMX will way out perform their larger/heavier lead based competition.

Think about WHY the Nosler partition became so popular, it was because it retained most of it's weight, and thus penetrated deeper.

I would put the 168gr TTSX in my '06 (at my MV of 2970) up against any 200gr from a 300 WM any day, up to 600yds. No animal out there would ever know the difference.