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
a LOT of Money doan't buy you ANY Class..old South Oak Cliff mantra
Those who fail to learn from History are doomed to repeat it...Santayana