I haven't had any trouble killing deer with cup/core bullets. Most of mine have fallen quickly to various 150 and 170 grain .30-30 bullets from Win., Rem, Horn. or Sierra. Another sizeable bunch to various 85, 95 and 100 grain C&C bullets from my .243's and no complaints, difficulties or failures there either. Shot a deer in the azz once back in 1981 with my .30-06 and 180 RNCL. Haven't found the need or desire to do it again and there's been one hell of alot of deer killed between then and now.
