Out of a very good shooting conicalrifle (such as a White) you can get
a 3" group at 200 yards. However there is a big drop.
Shooting a 460 conical over 100 grains of T7 with a wad
77 yards 3" high
118 yards dead on
160 yards 6" low
200 yards 20" low

These are all verified numerous times.
Redclub