Might add a note to your angle fire page.
As you show, the actual distance is line of sight distance times the cosine of the angle is the actual distance to the target.
You still have to account for the wind the full line of sight distance.
Line of sight distance being 600 yards, at 30 degrees. You cosine would be .87 giving you the distance of 522 yards. Meaning your elevation is set for 522 instead of 600.
But the wind effects the bullet for the full 600 yards.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071