Not many.
140gr old .270 BT failed to pass-through on close-range facing neck shot
100gr Sierra PH 6mm blew up the heart of a doe standing broadside at 100 yards
180 Core-Lokt factory .30/06 through the shoulders of a pretty big 8-point. That deer reared up like a horse and fell back, stone dead.
295gr Barnes T-EZ ML bullet over 80gr of BH lodged, perfectly expanded, in the spine of a buck between the shoulders after a frontal shot at 40 yards
130gr .270 Hornady IL bounced off the far-side chest wall of an average buck at 40yards. Knocked a tuft of hair off that far-side. Total destruction, but deer ran over 100 yards.
150gr Sierra .308 (forget which one) struck a buck going away, downhill, in the V of his chest. Found a little lead "button" behind his ear when I cut off his skullcap. That one's interesting.
Have actually only found a few inside, notably the Barnes ML, the lead button, and the Hornady .270.