Well, it's raining ... has been all week.
Guess I might as well wade into this free for all.
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First, arrows have killing power beyond "normal" explanation.
Kinda like seeing pine needles blown through [lumber] walls in a hurricane.
Call it voodoo.
When I graduated to the then new hot dog recurve bows, we were amazed at what they could do ... "instinct" shooting ... with NO sights !
... Fred Bear was taking elephants and lions with a recurve bow, ... and broadheads.
... many years ago, ... before the fabulous recent advances in modern compound bows, arrowheads, and archery in general.
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My Choctaw [native American Indian] Aunt probably killed more deer with a 22 rimfire than most men ever see.
Of course, she could literally slip up on me ... and put a hand on my shoulder ... to let me know she was there.
Never heard or saw her coming.
I swear she just "materialized" out of the air.
She could have probably taken bucks with a baseball bat and harvested does with a golf club.
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It is quite simply WRONG for a SPORTSMAN to hunt deer with a 40cal.
Will a 40cal kill a deer?
Sometimes.
Is it possible to kill a deer with a Daisy BB gun ?
Yes.
... Does that make it right?
Not no, but NO !
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We have been experimenting with bullets for hundreds of years.
I have been personally testing them for well over 50 years.
I have seen rabbits killed with a single pellet and men killed with tiny cuts.
I have also seen deer ... and men ... fight with dangling arms and fractured skulls; and even run on shattered legs and blown out lungs.
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Over my lifetime as a Deputy Sheriff and a Military Police Officer, I can assure you that ...
cops and soldiers carry pistols ... when we aren't expecting trouble ... or as a backup to our primary weapon.
If we see trouble coming, we grab rifles, shotguns, grenades, mortars, howitzers, tanks, planes, ... and trains.
Confronted with a charging drug crazed speed freak or his Rottweiler,
at close range,
we would prefer a 12 guage "riot gun", a broadsword, a cutlass, or ... a baseball bat.
Once you get him stopped, .... use your 40cal pistol for the
"coupe de gras" .
A baseball bat is more likely to save your leg from a Rottweiler.
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In spite of all of the hoopla about kinetic energy, hydrostatic shock, primary and secondary wound channels, permanent and temporary cavitation channels, etc., etc.
the only thing that we are absolutely certain of is that:
massive rapid blood loss kills any living thing;
[we have no conclusive evidence on Zombies, mummies, vampires, and / or werewolves]
and ...
bone crushing penetration makes it very difficult for the afflicted critter to catch and kill you.
Anything else is speculation, theory, and ... the great stuff that sells, magazines, guns, bullets, ... and beer.