Ashby's finding are nothing more than physics and while they are true,the balance a hunter is looking for,especially when it comes to deer can differ and not offer a concrete answer on what's best.What i won't argue with is the desire to have a complete passthrough every time.That's not even debatable in my experience.You want to two holes.Do you need a 650gr arrow with a single bevel to kill deer?Absolutely not.If I were hunting pigs over a feeder or dangerous game,I'd probably go that route but since I hunt deer,I want a compromise between quiet,a flat enough trajectyory and achieving full penetration every time with a BH that's razor sharp and doesn't fall apart.Finding that combination is almost limitless.
I also don't believe that blood on the ground is the end all be all and it's more of a function of where the deer was hit,rather than what it was hit with..If you shoot a quiet bow with a quality fixed head at unalert deer,you should see the vast,vast majority stop,wobble and drop over.At the very least you should hear them crash.If you don't,you didn't hit the deer in both lungs and you need to back out and wait a min of 12 hours and not even check your arrow.If you do that,the vast majority of marginal hits that are actually fatal should be found without needing a blood trail.
I also don't believe that blood on the ground is the end all be all and it's more of a function of where the deer was hit,rather than what it was hit with..If you shoot a quiet bow with a quality fixed head at unalert deer,you should see the vast,vast majority stop,wobble and drop over.At the very least you should hear them crash.If you don't,you didn't hit the deer in both lungs and you need to back out and wait a min of 12 hours and not even check your arrow.If you do that,the vast majority of marginal hits that are actually fatal should be found without needing a blood trail.