i used one rocket steelhead to shoot 3 deer (new blades for sharpness) 2 deer were through both shoulders. fixed broadheads DO NOT fly like field tips ever. they may go to the target ok but there is alot more turbulent air infront of the fletching with fixed blades. doesnt mean they dont hit or fly right but they dont fly like a field point the fletch gets less control with anything sticking out in front.

ive shot tons of deer with mechanicals ( i dont shoot anything over 1.5") 75% pass throughs.

shot about 10 deer with fixed (muzzy, cabelas, wasp) only 4 pass throughs. all depends on the hit not the head (as long as its a good one)