I have limited experience with killing deer with stone, having only taken three, but I have taken 76 to date with traditional gear, ie. longbow and steel heads, so I think that my experience is viable enough to place my opinion. Billy made some heads for me to hunt with last fall and I was lucky enough to take three deer with them with my selfbow, I limited my shots to fifteen yards or less and you will have a hard time convincing me they do not work as well as the natives that used them for thousands of years. I think from reading thru this topic that alot of people have had bad results either because improper arrow and bow tuning, or shot placement, which the two together create undesirable issues. I am a raging lunatic about accuracy and the tuning of both my arrows and bows, Just ask Billy I think I drove him nuts trying to explain my way of both shooting and tuning. I very rarely comment on this forum but do lurk here alot to see what everyone is up to, opinions are up to the individual, but I figured I would place mine as well and it won't be chagend anytime soon, stone heads work when in the RIGHT hands! And to prove my point the next elk hunt I go on Billy is knapping me some heads for that hunt, if when I get them and they shoot fine and I have confidence in the setup, I have no reservations about using them to take elk.