BDC reticles certainly have their place, they're not as precise as dialling but for hunting applications were limited prep time is available they are hard to beat especially out to 400 or so They apply at one magnification usually the highest but can be used at others, ie at 6x 200 m at 3x 400.
You need to work out what the drop marks relate to for your cartridge and record that somewhere. One of my favourite scopes is a 1-6 strike eagle on a 7.62x39 and it's reliable to 420. A Mil dot reticle is equally useful as a BDC to be honest, probably more so.
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