This isn’t correct. If a scope is listed as 50MOA, then it only has 50MOA total, not 50 up and 50 down.
We also have to accommodate our optic height and absolute drop to 100yrds, so we lose around 3.5moa on the bottom side. For example, a Leupold VX-Freedom is listed as 60moa, on a flat rail, optical center is +/-30moa, so if it’s sitting 2” above bore in a 308win, with 2.3” of absolute drop at 100yrds, 4.3” total compensation in the 100yrd zero, 4moa, we only have ~26moa available to dial, so we’re stuck dialing AND holding for anything past ~940yrds. Adding a 30moa rail to that rifle would allow use of 56moa of elevation, getting us out to 1400yrds before running out of turret.
What in the world cartridge are you shooting with 60moa of compensation required at only 1000yrds? That’s my DOPE for 1,000 for my 30-30… 60moa is around twice too much drop for conventional 6mm to 30cal short action cases used for LR shooting.