With due respect, maximum range from small arms is achieved by shooting at an angle of about 32 degrees from the horizontal. 45 degrees would be the optimum in a vacuum. Gravity works at a constant rate, regardless of the velocity of the projectile, but the velocity is dropping off from the moment it leaves the muzzle, thanks to air resistance. As a result, a bullet's trajectory is slightly hockey-stick shaped rather than being a symmetrical parabola.
Gunner officers, who are all blessed with far more brainpower than me, assure me that artillery projectiles are less subject to this effect, due to the reduced effect of air resistance at the altitudes that the shell flies through much of it's trajectory, and that the optimum angle (for range) is much nearer to the 45 degree elevation.
But SAA ? 32 degrees, +/- a degree or so.
Barrel inclination for .303 MkVII to impact at 2,800 yards was only 10o 10.5'
(Caveat. I don't know if that was calculated for a ground strike or a human height strike).
It still feels like a crazy elevation when you set that on the volley sights. Rather underlines how a careless high shot on a range can send the round over the hills and far away...