Back in the days when there weren't too many bullets to choose from, you got more penetration by going to a heavier bullets. I would expect that, given the choices available now, the sales of 220 grain .30 caliber bullets has hit an all time low. My experience, in the .300 Win Mag,has been that a Barnes X bullet of 165 grains will penetrate as well as a 220 grain Hornday roundnose. And the 180 and 200 grain Barnes X . . . .