Sorry, I guess the extra barrel on the full size MP5 makes the difference.
From the video, it looks like the optics are around 3 inches or so above the bore-line. I would think that the sight alignment for a 25 yard zero would also have to take this out as well as the gravity drop. This would force a larger tilt. A half inch tilt at 25 yards would boresight about 2 inches at 100 yards (4 times greater). Correspondingly, a 3 inch tilt would boresight at around 12 inches higher at 100 yards. This could account for the aimpoint performance observed since it would compensate for the gravity drop.
Am I missing something?
Where it does begin to show effect is in the falling branch of the trajectory, where the second line of sight crossing will occur.
Aside of changing the HOB, the velocity, or the BC of the bullet, this can't be controlled; you just have to be aware of where it is.
Your sighting system, from irons on the barrel to a powered optic with a giant bell in a high mount, is over the bore. There will always be a height over bore. The sight line is straight whereas the bullet arc is parabolic. So, the bullet is going to cross the sight line twice (a point at which they intersect, or a zero point) once where you have intended and again somewhere else. Where that other point is will be influenced by the distance between the bore axis and the sight line (the height over bore).
Hokey religions and ancient weapons are no match for a good blaster at your side, kid.
Last edited by fargo007; 09-13-2017 at 07:55 PM.
I would zero at 25M for that weapon. Great for close in and flat shooting for up to 100M.
So many HKs so little time.