I would go with mil-dot over bdc. Mils are mils, BDC......BDC for what load? I would also go with these rings....http://www.midwayusa.com/viewProduct...tNumber=148716 they make them for 1" scopes also.
Edit- I see that the Vortex BDC is MOA based, it seems confusing to me though with odd demarcations. 1.5moa, 4.5moa,7.5moa...
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