From the right angle, with good light, you can see most any bullet in flight, from rimfires and black powder to the centerfires. Just recently there was a show on the History channel showing military marksmen shooting 300 win mags at 500 yds IIRC, the bullets in flight could easily be seen in several clips. Was at a black powder silhouette shoot once, standing above and behind the shooting line, the bullets in flight were real easy to see. Nice shiny projectiles are the easiest to see, the sun needs to be just at the right angle to your view, also. :wink:
Tim