Basically, gravity works at a 90 degree angle to the earth, so the bullet is technically going a shorter distance through the effects of gravity at anything above or below shooting perfectly level, therefore less bullet drop when shooting at angles. I have found though, that when prone behind the rifle on a downhill slope, my body weight leaning into the rifle exerts different forces onto the stock than shooting uphill and having the rifle leaning back into me. Consistency is accuracy so potentially your shooting position sent the first high if it was floating against your shoulder a bit?
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