It happens to all of us sooner or later.

Moving deer are a really tough game. When I was younger I tended to take a lot of shots at jogging/running deer, luckily I seem to have a natural talent for leading them. As I have gotten older and wiser I try to avoid or pass on such shots though I did shoot a jogging doe at 140 yds this year. That's the first in 6-8 years, I imagine.

The necessary lead on a moving deer is really surprising. Google "eskimo ballistics" to find the JBM Ballistics calculator and enter a close approximation of your load. Pay attention to the target speed field, as it will calculate the necessary lead to hit your target. Play with this speed and watch what happens to the necessary lead. It is much more than most people would guess!