You can definitely see bullets in flight.
Some years ago I was shooting a friend's PPK .32 Auto and you could see the bullets glinting as they went down range.
Earlier this year I took my new Colt out to shoot, .38 Special, 158-gr. cast lead bullets loaded to about 850 fps.
We were under a covered shooting point with a bright sun at a fairly high angle behind us.
The sun was hitting the base of the bullets and reflecting like crazy. They looked like tracers going downrange.
But, in most cases, the snake is going to be on the ground, looking up towards the sky, most likely, which would make it a lot more difficult to pick up the bullet.
I simply don't see it happening.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.