Welcome to the forum.
As tahqua mentioned, i have a Leupold M1 Mark IV 4,5-14x50 LR/T Ill. and i must say it´s a fantastic scope in my opinion.
I have had it for app 5-6 years , and it have never let me down i any way. It is still very firm in the clicks and still dead on when i click it up and down. ( i am not only using it for hunting, but a lot on the range too.)
I havent tried it out on 800 yards, but up to 5-600 i haven't had any complaints. You don't have to worry about performance when the day is beginning or ending, it works damn good in low light too. When i bought it we off course , had to test it against my friends Swaro and Zeiss, and without telling to much i have to say that we all were impressed.
Let's know what you end up with.