You may be able to someday theoretically achieve the results with technology but that doesn't mean you'd be able to use it. In this case because of state laws governing minimum arrows weights etc. It's also a bit counterproductive to use lighter and lighter projectiles with a bow. As the projectile gets lighter, the bow converts less of it's stored energy to the arrow because it encounter less resistance from it. You'll end up getting more of the bows energy as vibration and noise, and less and less of it actually propelling the arrow any faster.
I noticed that with the heavier arrows too. Just for kicks I shot some of my old arrows over a chronograph with some of the heavier stuff I shoot now. As you'd expect the lighter arrows were faster, but any increases in bow strength or draw gave the lighter arrow less advantage. The relationship between arrow weight and the energy extracted from the bow isn't linear. I shot both arrows from the same bow on the same day from the same distance over the same chrono. The only change I made was turning my draw weight up 5#. That change netted me an extra 10 fps from the heavy arrow and an extra 5 fps from the light arrow. Those gains may sound insignificant, but for something only going a couple hundred feet a second 10 fps is a 5% gain in speed. Would I gain 10 more fps if I turned it up another 5#? I dunno. I didn't do it. I only turned it up to 65#. I'd still expect to gain more on the heavy arrow though, though I can't say with any degree of certainty how much. It's kind of fun to play around with that stuff though.
The point I was making about hydrostatic shock is that it does more damage to surrounding tissues than the actual bullet does. The point would still be to hit the vital organs, but with a bullet there is more leeway because of the shock. You can destroy arteries and tissues you didn't hit, with an arrow that isn't really the case. That's also not to say the shock is so great that you can shoot a deer in the ass and kill him, but you could disrupt the central nervous system without actually hitting it. Passing a bullet near the spine would likely be sufficient to paralyze the animal. I think of cavitation and the like along the same lines of how a torpedo works. The goal of a torpedo is not to detonate on impact with a vessel, it is to impact below the vessel, and create a cavity or a pressure wave that will break the vessel in half. While putting a hole in a boat is good, snapping it in half is better. It's the same with a bullet. Ideally, you put a hole in what you want, but as a corollary, you also get a huge pressure wave that does as much or more damage than just the bullet hole.
Like anything else, kinetics and momentum and all this other stuff related to it, like the bows, arrows, points, etc is all a compromise. You pick what meets the needs you set for it. The best bet is a compromise between the weight and speed of the projectile. Which is what it you've done. I thought about tuning mine back down a bit to get some more range and minimize the range estimation, but it isn't really necessary for me. I like how the bow shoots and it's extremely quiet. Though I was worried at first if I was going way too heavy. I went from around 400 grains to 620 grains. Haha, aside from the 7th pin on my Spot Hogg being just for looks, I have no regrets.
It just seems lately that everyone is solely concerned with more speed. I'm not saying that because of anyone on here or any of this conversation though, just a general observation. Nobody touts their bow for being quiet or light or efficient, but everyone talks about how fast it is. It seems like pending some sort of major technological break through, speed has gone about as far as it's going to go with the knowledge and materials currently available. It seems like 350-360fps is pretty much it. There are some one off custom operations or guys tweaking stuff or shooting super light arrows that got up around 600fps a couple times, but production bows seem to have hit the wall in what they're capable of safely doing. Now technology seems to be focusing more on the arrows. Making arrows stiffer, lighter, stronger, and smaller in diameter.
