george, I think you are overestimating the intrinsic physical demands of shooting a gun passably well. It is far easier to learn to shoot a gun decently well than to learn to play golf at a competent level, for instance. It is easier than learning to safely drive a car on modern highways. The physical barriers are pretty low until you get into high-level competition or the combat equivalent. It does require a fair amount of time to refine and to maintain the skill(s), which many "shooters" never bother to put in. The same is true for learning to drive a car, throw a football with a spiral, hit a 9-iron onto a green, perform long division, etc.
If you're talking about reaching the olympic level of shooting, or the equivalent in other shooting sports... yes, it will take a combination of talent and training and time. But to get better than 90% of people at an average, open-to-the-public range? No. Talent will reduce the amount of time required, but no great level of talent is a prerequisite. Less talent = more time/work required. But the threshold level is low.
If you're talking about reaching the olympic level of shooting, or the equivalent in other shooting sports... yes, it will take a combination of talent and training and time. But to get better than 90% of people at an average, open-to-the-public range? No. Talent will reduce the amount of time required, but no great level of talent is a prerequisite. Less talent = more time/work required. But the threshold level is low.