If I understand trap: the target starts at about 42 mph, 16 yards away, goes basically straight away, and is about 4” across and about 3/4” deep…very small target traveling very fast, probably never being broken much closer than 30 yards…never gonna come at me, or give me a crossing shot…and the shooter has a fair idea with each shot what will be presented…I can see not using IC. Very different than hunting wild birds that start at 0 mph…and that are much bigger than a clay pigeon…which we all know. If my math is correct, and it may not be, 40 mph equates to about 57’ per second…so, 42 mph, roughly 20 yards per second…so, a goofball like me that pauses too long, and shoots after one second is shooting at a 36 yard target…sometimes further, sometimes closer…it seems to be a game with many fewer variables than other clays games or bird hunting scenarios.