We shoot them at around 70 yds in an old quarry we shoot in. I can pick them off standing with my fac and once the other lads get their eye in with sub 12s they're flying call over the place.
The only downside is it's 3 climbs and two walks to find them again, perch them on the rock face and get back up onto the other side to shoot them again.
Good fun tho. They don't half fly when you catch them right eh.