I use to use the Big Magnus myself. I had good blood trails consistently with them. I thought that I never had any issues with them, they always seemed to fly good in the common Iowa cross wind. Until one day I had wind bucking hard off of a bluff. Whether it was the direction, the turbulence, the sheer force, don't know, I shot another arrow and about the same results, but they did not like that situation. I went and found my shot heads and fired them back at the bluff and they flew perfect. Normally when hunting near switch grass fields, I have a Deadhead or two in my quiver, the big ones, last year because of other hunters and the thermal drift, I shot a deer with a Mussato style file sharpened Schulz Hunter's Head along the edge of a switch grass field. The blood trail was gushing and short, I could easily smell it in the cold winter air. Like normal the Hunter's Head went through the deer like it wasn't there and buried deep in the snow and the switch grass somewhere. The deer went down in plain sight in less than 50 yards. I guess there are always variables that we cannot predict.