I used mechanicals for a while (~270 fps), but the crummy penetration and mangled heads I realized steered me back towards fixed blades. I used many styles of heads and finally came to the conclusion that one-piece, cut-on-contact heads are superior for big game. I hunted the last 2 years of my compound days very content with 2-blade heads. Shooting wooden bows and arrows now at ~140-150 fps, I typically get passthroughs unless heavy bone or dense muscle is encountered...still using cutting point 2 and 3 blade heads with 600-700 grn arrows.