Meaning the farther away a focus on is, the upper the rifle’s muzzle will need to be angled to ensure that the spherical to land correctly, developing a curved trajectory. A rifle scope is normally comprised of the system, eye piece, objective lens, shoulder, and windage, elevation and parallax knobs. https://reloading-ammunition61604.liberty-blog.com/31113849/hunting-suppliers-uk-for-dummies