I had trouble with the large Magnus two blade 160 grain. We were convinced at the time it was the ultimate for us. Could get them sharp enough to shave a cat, we had numerous pass thru kills with excellent blood trails. One day I took a thirty yard shot at a large sleepy buck with the wind coming from behind me on the right side. The arrow took a side step like I have never seen before, luckily it missed the deer. I reshot the arrow back to my position and it shot fine, reshot again back to where the buck was and it side stepped again. I went to single bevel broadheads after that and no longer have a side stepping problem with quartering tail winds. I use either 5.5" or 5" helical depending on the bow. I could have stayed with the big Magnus and just never take a shot in the kind of wind situation, but then I need all the help I can get because I do not hunt a areas that are overrun with large bucks, just lots of people to deal with messing up the deer movements.