In the '60's we used to chisel the points on our bear Razorheads,like Fred recommended.Somewhere along the way,I stopped doing that as it became impossible to spin the arrow on the tip to check for broadhead alignment,which I liked to do after any shot at game.
Later,using 125 gr Magnus heads,I took a quartering shot on an antelope,the tip curled,causing the broadshead to skip across the ribs,under the shoulder instead of through them.Penetration was horrible,out of a 50# bow.
I was very lucky and this was the only place where antelope went on the entire ranch,that had some stalking cover.I was able to get a second arrow in it,about an hour later.I'm convinced that animal would have survived that shot but that incident has stuck with me and will forever.A situation like that could have gone a hundred different ways,most,not good.
These days,I either use heads with tanto tips or I would apply it myself.I kick myself for not having done it on the Magnus.looking through my stuff,I found a couple more that curled like that but not on game.The tanto tip would have stopped that.
I had a Bear Razorhead's bleeder blade twist and mangle the slot in the head.They were supposed to break away and allow the head to penetrate.I have never had on sheer off.I can't remember what was shot with that head.