Classic Weapon Positions (Halo 3)

Settings > Gameplay > Weapon Display Offsets
(note: This was done at 90 FOV, mileage may vary)

I feel Lowered Crosshair was much easier to replicate as this is how the game originally was
---
Melee
Depth: 15
Horizontal: -5
Vertical: -5
---
Pistols
Depth: 6
Horizontal: 0
Vertical: -7
---
Rifles
Depth: 15
Horizontal: 7
Vertical: 2
---
Heavy:
Depth: -10
Horizontal: -8
Vertical: -3
---
Duel Wield:
Depth: -8
Horizontal: 0
Vertical: -7.5
---

Note: It's harder to get all the weapons to look correct with the centered crosshair as the game was made for lowered crosshair, but this was the best I could do!
---
Melee
Depth: 15
Horizontal: -5
Vertical: -5
---
Pistols
Depth: -20
Horizontal: 0
Vertical: 15
---
Rifles
Depth: 15
Horizontal: 7
Vertical: 6
---
Heavy:
Depth: -10
Horizontal: -8
Vertical: -9
---
Duel Wield:
Depth: 3
Horizontal: 6
Vertical: 3

https://steamcommunity.com/sharedfiles/filedetails/?id=2930957044