Question about reticle
Ive been looking on different websites at their reticles to help me decide on the scope I want. Ive noticed nikon has their bdc and bdc 300 and bushnell has the doa. They have different marks on the vertical part that are for different range shots like if you zero it at 100 yards the circle below will be for 150 then 200 then 250 then 300. The question I have is do these really work since each round has a completely different trajectories? I wondered if its just universal and isnt exactly on for every round or if they make them for different rounds?
Thanks for any help in advance.