Gravity affects the bullet. (We all know this!)
And gravity tries to pull the bullet straight down vertically.
So while you’re shooting at an animal 300 metres up a steep hill the gravity doesn’t pull the bullet in towards the hill but rather it pulls it straight down (as it does a plumb-bob)
So your bullet is only affected by gravity for the distance of the base of the triangle as per the pic supplied by ChrisW.
Of course I may be completely and utterly wrong!!!
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