Can anyone see bullet holes @ 600 yds ?

Yes is the short answer. I've got a 30year old weatherby sporting scope that can see 30 caliber. Don't know who made the glass although I'm sure it wasn't them and it's turquoise in color. It's scuffed up now as it spent many of those years in a saddle bag atop my old mule in New Mexico
 
I use a target camera from Targetcam.net. It is less expensive than a good spotting scope, and mirage doesn't affect the image since the camera is about 20-25 feet from the target. I've had the target camera out to 1765 yards, with no image degradation.