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Higher velocity and a longer sight radius both effect the near/far zero
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Perhaps this is a your milage may vary situation. I used the official zero target at 22.8 meters instead of 25 meters. This was at 25 yards since I don't have access to a range calibrated out in meters.
I then used a B27 at 300 yards which is 274 meters.
If 1 minute makes a difference with the sight in target used in a range set up for yards on a drum calibrated for meters... I will let someone else calculate that out.
But if you zero a M4 and M16 both at 25 meters or yards, the far zero will be further out for the M16 due to its higher velocity.
Glad you addressed this. I was thinking this same thing when I watched your video.
Higher velocity and a longer sight radius both effect the near/far zero
The sight radius would have no bearing on near far zero, but it does have a direct affect on point of impact adjustments to the front and rear sights pertaining to elevation. The Shorter sight radius equates to more aggressive adjustments on the carbine. An optic eliminates sight radius but the rifle or carbine would have the same near and far zero despite a change from irons to optics.
See the following chart which discusses the more aggressive elevation adjustments going from rifle to carbine:
Remember the M16A2 is a 1 minute drum, where as the M4 and A4 are 1/2 minute from the detachable carry handle.
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Has anybody tried this yet with their own rifle and can report back?
It should get you on paper. A 25 yard zero has a very far zero at 400 ish yards with m193 according to my ballistic calculator. In my case, striking low could be due to a grouping slightly below the center of mass on the shilouette in addition i did not use sling tension to obtain my 25 yard zero. I proceeded to use sling tension for the 300 yard portion of the shooting on a non free floated barrel. This is why I believe I had to come up on the front sight.
This method works well, but with all the setups people have out in TV Land YMMV.
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