Should I use a BDC? Or not?

So you are out in the woods, stocking your target. The winds are light and variable and the weather is sunny and clear. You crawl over the rise and locate your target. You use your mildots and estimate the range at 640 meters. Your Leupold mk4 3.5-10x40mm LR M1 is dialed in for a 300m zero. So based off of environmental conditions you figure you need to dial in another 14 MOA of up elevation into your scope, or 56 clicks since it is .25 MOA per click. So you start dialing in your dope, counting off all those clicks to get to your desired 640m zero. Of course, what…

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