RE: broadhead's??
If you're only shooting a 40 pound bow,I wouldn't reccomend muzzys. Yes,they are great heads and have taken countless game BUT with only 40 pounds,you need a cut on contact broadhead. In all my testing (game as well as testing mediums) of different heads,I really like the razorcaps. They fly extremely well,are welded together so there's NO possibility of losing/breaking/bending blades,and the gradual angle of the blades seem to penetrate better than heads that angle out sharply and are shorter. With only 40 pounds to work with,you need everything on your side that you can get. I reccomend that you stick to close range shots and wait for ideally positioned shots-ie quartering away slightly and try to double lung it.
I'm confused,in your signiture you list a 70 pound bow as well as a 40 pound bow. If you can shoot more poundage WHY limit yourself to 40 pounds?
I'm confident you have a good reason.