Well, not really. The 5.56 gains in elevation right out of the barrel, then starts to drop.
When I bought my first 5.56 the guy selling it told me how the projectile performs at various distances. It was obvious he was telling me the bullet goes up from the line of sight then drops. When I started shooting it, it was obvious he was right.
A good article discussing the subject is
https://www.everydaymarksman.co/equipment/barrel-length-trajectory/
My first 5.56 is a 16 inch barrel. The next purchase is a 20 inch barrel which is more accurate due to higher velocity.
Two points to make here, is you’ve got to do range time at various distances and settle on a good distance to zero in on. Fifty yards is my choice.
The second point is the assassin was well aware of what I just said, as he had a range finder and must have had a range card indicating the rise or drop of the projectile for an accurate head shot. The good news is Trump turned his head the same time the assassin decided to pull the trigger.
The assassin was not the idiot his high school buddies said he was at their rifle range. Someone trained this guy in ballistics as well as political thought.
If the barrel is level, what possibly can cause a spinning bullet to 'lift'?