|I think that for most men it is about extension of power. I know that idea is frowned upon, perhaps even by members of this fine forum, but I think the ability to affect our surroundings beyond arms' length is very alluring.|
Also, I enjoy the ongoing mastery of a particular piece of equipment. Each of my guns shoots just a little bit different. Becoming competent with each of them is part of the challenge. Obtaining perfection is a goal I'll strive for, but never achieve.
The scientific aspect as well. The violent chemical reaction initiated by a mechanical force that imparts energy upon a projectile is fascinating. Making it all come together consistently is the challenge.
Yes, we can measure the powder and load the slug to a certain length in the case. The rifling of our barrel stays the same, but the biggest variable is between our ears. How we respond to the external stimuli when on the firing line defines, to me, the greatest challenge of the mechanical aspect of shooting.