I really have no Idea. For me it would be maybe 50 yards with a good rest. On you tube many folks are shooting deer farther. It would be irresponsible to shoot at distances without using a range finder. Crossbows and all bows have quite an arc in the trajectory. Knowing the exact distance is crucial. The scope with mine is graduated 20, 30, 40, 50, and 60 yards. I have never shot a deer with any kind of bow.
I have not hunted deer in over 20 years but before that I harvested 21with a rifle, all but one were under 50 yards, one was 75 yards.
As with all hunting shot placement is the key. Risky shots should always be passed up.