Well I guess no body else will ask, But Are you guys really serious about shooting Deer with a Crossbow out to 120 yards.
Been a bowhunter most of my life and have seen to many things that can go wrong beyond the shooters control on the longer shots.I also shoot a StrykeForce and can hit the target at long yardages and pretty accurately.
No offense but For me and most every bowhunter I know ,even some on this list who are great shots,would never think of taking a shot at that distance.
As for me personally,I really don't think that kind of shooting distance for game would be ethical,but for each his own.
This is a very good question. A 120 yd shot with a 385'/sec launched bolt will be about 344'/sec at 100 yds according to the earlier mentioned formula. I would have thought more velocity loss than that. Energy would be 111'/lbs @ 100 yds. This is a LOT of energy! The time of flight would be appx 1 sec. A feeding deer, broadside to the hunter, looking away from the hunter would likely be stationary during the shot travel time. A bedded deer would likely be the same case. An ethical shot is one that the hunter has a high degree of certainty that he can make a quick, lethal kill. The ability of the shooter(lots of good home work - shooting) and the situation present(wind, distance, state of the deer, rest available for shooting, good range measurement,etc) all present factors to determine ethical maximum range for each situation.
The problem I see is that while great groups can be obtained at these extreme ranges, the trajectory is so extreme(10 yds - 90 to 100 yds has 26" of drop difference with 425g bolt launching @ 385'/sec) that range would have to be measured to the yard or almost, the shot would have to be perfect, and the animal must not move. All that said, if a hunter routinely shoots from 10 yds out to 100+ yds, and practices in field conditions and literally shoots enough to be really proficient, his effective range will be greater than the hunter who relegates his bow or x-bow as a 30 yd max or 40 yd max weapon. 100 yd deer shooting even with great , consistent groups at that range is not likely. If I ever did it, I doubt I would ever mention it:).