I spent several years competing in 10 metre air pistol, got up to about 92/100 scores consistently, or 553/600 in several competitions. Not brilliant, but rarely hit outside the 9 ring. A bit of a shoulder injury took me out of that but I've maintained my marksmanship with informal HFT shooting in Mission and practice at home, indoors. No trouble generally hitting what I aim at, and rifles are a whole lot easier to shoot accurately than pistols held in one hand. For the moment I'm more focused on learning animal life cycle stuff, behaviours, efficiently dressing game (bit of practice on grey squirrels and I have that just about wired - from taking the shot to ready for the pot in under 3 minutes), learning the many rules around hunting and land use and forest etiquette etc. in BC... it's a lot more complicated than going out and shooting something.
While I can see the logic behind heart/lung shots as being more reliable in terms of downing a large animal, it's hard to wrap my brain around that shot being more 'ethical' considering that the animal remains conscious and very much alive for often a minute or more. Sure it's consciousness is fading with blood loss, more or less depending on exactly what's been hit and with what intensity of force, but at least 15 seconds to die seems very, very common from all the films I've seen. Even some of the most famous hunters (Steve Rinella for example) frequently watch for a while as the animal takes time to die. How is this ethical?
Early on in my pursuit of garden-destroying Eastern grey squirrels I often took body shots, generally from the side, looking to place a pellet just behind the foreleg and into the heart. More than half the time this was successful. But merciful? Not terribly, as the animal would lay there taking seconds to die, aware of its fate. With correctly placed head shots it's lights out. Over. Done. I can't fathom any hunt being more ethical than that. I've stuck with head shots since figuring that out, and if a good side-on shot to the dime-sized target between eye and ear doesn't present itself, that squirrel lives to meet again another day. Doesn't happen often as in studying their behaviours I've learned how far a bit of patience can go in waiting for that presentation to appear. Getting 'lucky' with body shots just doesn't interest me when an animal's suffering is on the line. Besides that, there's more undamaged meat available with head shots.