I don't know about that, everyone's experience will be different. I shot my first whitetail deer 32 years ago this fall with a borrowed .243 Winchester. Since then, nearly 50 deer and probably 10 or so with a .243 in some form or another in mixed country. I don't ever recall having an issue with blood trails or tracking deer, but I've also not had one end up in the water and my shooting lanes are wayyy bigger than 4 ft in general.Well that should stir pot lol
Bears are a different story, my last one was shot at 90 yards with a .300 Win Mag and there were a few drops of blood at the impact spot and that's it. It wasn't even a big bear, and the bullet went through both lungs (180gr Partition). It only made it about 15 yards, but nothing more than a couple drops of blood on the ground.