You might be able to see 30 cal holes at 800 yards with a stand up tripod sized telescope, but doubtful with a typical table top shooting range styled spotter IMO....and I'd be looking at glass that started at Swarovski prices or better. Wind vibration is going to be a problem most likely too, so the unit needs to be heavy enough to stay anchored securly.
With enough money, it'll be a peice of cake.
Remember Aesops Fables outcome of the "Scorpion & and the Frog's" crossing the river when they get to other side
TooTaToo...We have MET the Enemy...and He is US !!... Pogo
Those who fail to learn from History are doomed to repeat it...George Santayana