I believe the introduction to new weapons and calibers has something to do with it. Alsothere is a higher population of deer. So many places are being built up, that the deer have to adapt to that environment. Some of the MOST HEAVILY populated areas are those that are unable to be hunted because the property is owned by the state or feds, or by private land owners.

The compound bow isn' t that old...It' s fairly new. All they had was recurves and long bows. When compounds were introduced, that drastically increased the amount of hunters. It was a big deal! Everyone wanted to try the compound bow cause they were tired of holding the draw of those long and recurve bows...It was tough!

Than you got the new caliber rifles....seems like a new caliber comes out every year. People wanna try them....see how they are, test them.

And when they get the caliber they want...you got reloading...Precise powder measurements and Technologically advanced reloading tools Reloading gets better by the year!

These are the reasons why I would say the success rate has increased