My SxS Kodiak was opposite, to a point.
82gr.(3drams) with round ball crossed by 2" at 50 yards and as well the barrels shot 4" different elevation at 50. Increasing to 100gr. They shot into the same hole at 50yds a 1" group.
With 110gr. They shot parallel. With 120gr. they were back to crossing by 2" & shooting at 4" different elevations as well but switched which was up and which was down.