When considering monometals the 150gr has proved itself to be totally adequate in 30-06 and 308W. My son used 150gr GS Custom in a 308W for a clean pass through shot on a wildebeest. I used 150gr GMX on a large boar with my 30-06. Yet, the Barnes folks recommended 180gr for my 308 Norma Mag. I thought this odd. Especially as Cutting Edge Bullets recommended their 145gr ESP (149gr w/ the tip) for moose, bear and deer in that caliber. I am thinking the same must hold true for modern lead core bullets. With close to 100% weight retention typical with some, me thinks any 30cal can drop to a lower weight. Maybe the way the bullets expand contributes to the need for a higher weight? The Barnes folks certainly know their stuff, so who m I to question the recommendation. Perhaps the way lead/Barnes expands has a higher drag effect? The GS Customs and CEB both form that blunt wadcutter shape which they claim creates a larger permanent wound channel. But, even considering this, I just dont think 180gr is needed for any application that a 30 cal is useful for. So, why do we still use it when loading modern bullets? It would seem 150gr is the way to go, maybe 165gr for a higher BC?