I've used and killed critters with both Magnus and WW. I stopped using the Woodsman because of tip curl I experienced on a hog hunt and after observing the other bent tips of Woodsmans that the Outfitter had retreived from lost hogs (they eventually located)that were shot with the WW. The same Outfitter also indicated the most successful trad hunters in their operation two-blade heads.
I've never had a problem with penetration with the Magnus BHs that I've used, although I've never used the bleeders. I was given some Muzzy Phantoms last year to try and used them with the bleeders on a deer hunt and must say that I was truly impressed with the performance. Shooting a 46# bow, that BH zipped through a broadside doe like she wasn't even there.
In general, I like two blades at my poundage, but I would not be reluctant to try the Magnus with Bleeders given my experience to date.
Claudia