Which of the following is NOT a common cause of hunting accidents?

Hunting accidents are unfortunately common, and most often occur due to human error. For example, with option A, failure to control the direction of the muzzle can result in accidentally shooting another person or animal. Option B is also a common cause as hunters may mistakenly identify another person or animal as the intended target. Similarly, option C can lead to accidents as using the wrong ammunition can cause the weapon to malfunction, causing harm to the hunter or those around them. Option D, carrying too much hunting gear, may not directly cause accidents, but it can contribute to fatigue and impair decision-making abilities, increasing the likelihood of accidents. Therefore, option D is the correct answer as it is not a common cause of hunting accidents compared to the other choices.