my experience ? I've killed two deer with my recurve, both with Thunderhead broadheads 3 blade. I got almost passthrough and complete passthrough.

that said I believe 100% in Ashby's studies, and in 2009 I'd lke to be shooting a single bevel 2 blade, or a double bevel 2 blade with bleeders

it all depends on sharpness - if I can get a head Thunderhead sharp, thats the one I'm wanting