Zeroing the HMR

[Foxyboy43]

Hmm.
You got me! Time to fess up - I was doing my standing on my head zeroing that time - part of my therapy for forgetting to push the record button.
None taken…..

 

[Cottis]

Could you expand on this a bit, please? Are you referring to just the HMR or other calibres as well?

It applies to all projectiles being fired from a barrel but the numbers change depending on bullet weights, muzzle velocity and ballistic coefficient and how scopes are mounted etc. The concept is the same though. The bullet passes through a certain zero at a certain range before the bullet drops back through another zero before it continues its rapid decent back to earth under the force of gravity.

Although the bullet does not in effect go upwards, think of it as coming out the barrel and going up through the first zero (42yds in the case of the HMR with a 17gn bullet being fired at 2550fps) and then dropping back down on to the 100yd zero before continuing to drop rapidly thereafter. Like if you threw a ball underarm at a target 5yds from you. The path of the ball will form an arc during its flight and the path of that arc will bisect certain points along the way. Bullet is the same just going much faster.

I've explained that terribly but hopefully you get the gist.

Positive vertical drop numbers (column titled "Inch") are below line of sight of scope and negative numbers are above it. Beyond 100yds the numbers would be positive and would increase quickly as gravity takes effect and drags the bullet quickly back to earth.