If the slope was 45 degrees, your 180m line-of-sight would be 127m true ballistic range (TBR). I don’t know your dope but I’m guessing that will be around 3” high, so the shot should still have connected with something if you were aiming low.
Shooting steeply up or down can be tricky as your shooting position can cause the rifle to jump differently against your shoulder. Were you shooting off the same sort of rest you practice with? That can also have an effect.
I run a 250m zero but then the trajectory of my 7WSM is way flatter than a .308. I’d recommend practicing uphill & downhill shots from awkward positions before changing your zero.
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