In Africa this year I saw a cape buffalo die in 23 seconds after taking a hit with an 800 grain arrow tipped with a 180 silver flame. We were at Vissers in South Africa and one of the other hunters did that. Heinke Lottering was the PH. After we viewed the video and discussion followed, Heinke said that they should tell all their buff hunters to consider silver flame heads. It seems that others have come there and killed buffs with them with a very high success rate of quick, clean kills. Considering that these PH's see quite a few kills over the course of the year I think that is a ringing endorsement. And Doc Asbell scores this head as #1 in it's class.
Other than buff, silver flames killed eland, kudu, gemsbok and quite a few others on my trip. All of us in camp were using them. My wife killed a 900 lb kudu bull with a 425 grain arrow tipped with a 100 grain silver flame. One shot in the heart, 3/4 arrow penetration, and that head acted like a slice and dice machine in the cavity while the kudu ran away. We heard the death bellows within a 100 yards. I killed a nice red hartebeest with a 700 grain arrow tipped with a 210 'flame. Somewhere at my release or his movement, probably both, landed that arrow in his neck instead of the double lunger I was shooting for. That 'flame lodged in his spine and cut the dickens out of whatever was around it. He died in sight of the blind.