I have a shotcam and it's great for clays, (will be trying it on birds next week) but that's at normal ranges of up to, what 50yds? Great pictures and very easy to review footage. The automation on it is brilliant too, no need to stop or start filming just fit and forget (it starts when it feels you've closed the action, so you'd have to figure out a way to start it by 'bumping' the rifle or something).
I've tried a GoPro on targets under floodlights, with the camera about 3ft from the target, and that wasn't clear enough to pick up the shot holes. The lens just can't gather enough light to reproduce a clear picture. Also the zoom isn't moving the lens at all, it's just cropping the frame down and 'blowing' it up, so your pixel size goes up and clarity goes down. (Just look at you 4k TV from really close and suddenly it all looks blocky)
I've used the ATN X Sight that has a recording facility, but at 32x zoom I could barely make out the target at 100yds, let alone where the shots are going, and that was daytime.
If you think how big a spotting scope is, or even a 56mm rifle scope, and the picture you can see through that at 200yds, you can start to see how big the lens would have to be on a camera to get a good shot at extended ranges. Think paparazzi camera lens!
That's just my experience with various cameras. I could try out the shotcam on my rifle next week if I go out, I'd be interested to know how it works out too.