A pretty knowledgeable person assures me that if I zero in a rifle at 50 yards, since that's the peak of the arc, I'll be shooting HIGH at 100 yards. When I draw it out on paper, it seems the opposite would be true: If I've zero'd at 50 - a high point on the trajectory - then I'm forcing the barrel lower when I shoot, and at 100 yards after the arc begins to fall, I'd be shooting LOW.
Who's right?
Edit: as a side note, there are only two rifles that I own that I would sight in at 50 yards - an AK and my PC4. This is actually more relevant for the PC4 because I had an old scope lying around so I scoped it. I dialed it in at 50 yards, and then went out to 100. At 100 I was getting a 5-7" drop (depending on ammo). Since it's .40SW coming out of a 16" barrel, one would expect there to be some drop at 100 yards. But, if the gun is shooting high or low based on the 50 yard sight-in, then that may have impacted the actual drop amount.
Who's right?
Edit: as a side note, there are only two rifles that I own that I would sight in at 50 yards - an AK and my PC4. This is actually more relevant for the PC4 because I had an old scope lying around so I scoped it. I dialed it in at 50 yards, and then went out to 100. At 100 I was getting a 5-7" drop (depending on ammo). Since it's .40SW coming out of a 16" barrel, one would expect there to be some drop at 100 yards. But, if the gun is shooting high or low based on the 50 yard sight-in, then that may have impacted the actual drop amount.