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Sect. Dens for both bullets as follows:
160 gr. 7MM Accubond 0.283
200 gr. 30 Cal Accubond 0.301
From all the listed Sec. Dens for available accubond bullets from 25 cal. to 0.375 cal. the 30 cal. 180 gr. accubond is the one with the very highest Sec. Dens and BC.
Check them out: http://www.nosler.com/chartaccubond.html
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Sd for the 200 grain is .301,and bc is .588-the 180 sd. is .271 and bc is .507.I do not understand your statement where you say that the 180 is the highest.The link that you posted shows the 200 being higher. A typo maybe?
range it,check the wind, dial in correction, aim and only one shot