Hunting numbers are declining, which is exactly what the anti's want!
If a crossbow gets a new hunter to start OK, let them start here and work their way to other venues of hunting.
BB's 340 fps bow and little time to practice is classic justification for crossbow IMO for many archers. Almost any bow that is 80% letoff and 340 fps, probably has extremely low brace height (under 7" and as low as 5.5"), which makes it super critical on release, highly subject to torque and is shooting superlight arrow with light head and low FOC and an archer with a long draw in order to get that speed. In perfect world, with perfect release and perfect side vitals shot, it will kill easily but it is not a forgiving setup without a high level of proficiancy, which BB has from what he has posted. If you have all those, then no issues, but that is hard for most bowhunters to maintain that level of proficiancy and to take only those type shots.
All of this is overcome by practice and perfect technique, which not everyone has time to do and maintain the perfect form. However, many bowhunters go to the superfast setups without understanding the trade offs and proficiancy skill level required to routinely make it work.
In fighting on the type of bow, let off of bow, type ignition, muzzleloader or not, length of bullet, sights, power of scope etc etc is only hurting hunting.
Again, to the delight of the anti's.
BH