Your Browser is OutdatedQ&A for Vortex Viper HD 5-25x50 Rifle Scope, 30mm Tube, First Focal Plane — 7 Questions & 5 Answers
First focal-plane reticles will scale with magnification, keeping your subtensions accurate to size at any magnification. Second focal-plane reticles will require the shooter to be on the denoted magnification for subtension accuracy, or, use a mathematical equation to understand the subtension value change with magnification change!
This optic is produced in the Philippines!
We do not publish light transmission figures, as there is no real industry standard for doing so!
It's different per rifle. The barrel length, twist rate, bullet design, bullet weight, powder type, amount of powder, etc. No scope is ever for one cartridge unless you get into specialized military scopes - they use the exact same ammo per weapon system. You can learn the ballistics of any scope with any ammo. It just takes a little testing. On some of their models, Leupold will send you a (CDS) custom dial once you figure out your ballistics.