Targets/coloring for 600 yards

[FLshooter]

I feel ya,A5. I am not into the technology either. I prefer a simple spotting scope.
But ,I have shot with folks down at the property that had a Camera target system they built out of An FPV camera/transmitter, like the one they use in a drone. Worked very well and for under $200 ,if you already own a laptop or an iPad.