muzzy 4-blade fixed 100 grain broadheads

[Rustywreck]

I currently use muzzy 115gr 4 blades.
I too have had problems getting 3 blade muzzys to fly well, though I haven't tried them lately - no need since I have a couple dozen 4 blades.
I have found 4 blades to fly better, partly because of the lower profile of the blades compared to 3 blades - less wind planing.
Tuning will make all the difference. Bullet holes are a great place to start, but its not the end. If your broad heads and field points are grouping differently, very minor adjustments to the rest and nock point will bring them together. It can be a tedious job, but it can be done. Moving the string nock or the rest in incriments of 1/32 of an inch at a time may be needed.
Of course, the first step in shooting a broadhead is to tune it to the shaft - make sure it spins with no wobble, and that you are using the correct spined shaft for your draw weight and length. If you find your on the line between two shaft stiffnesses, go with the stiffer one.