I've used the Burris scopes with the BDC for several years now and they work. But like the previous 2 posters said you must practice AND the BDC only gets you close.
With mine what I found very helpful for shooting the longer distances was initially sight in at 100 yards. Then shoot at 300 yards and fine tune the scope adjustment until you are grouping around the bulls eye. This should likely be only a minor adjustment and will still have you pretty close at 100 and 200 yards and likely at 400 (but confirm).
My .270 Win load however was right on the mark with the BDC out to 500 yards enabling me to take a nice mule deer at 437 yards. But I practiced all summer at long range and my rifle was very accurate. Shooting a rifle that shoots 3" groups at 100 yards IMO makes using the BDC nothing more than an educated guess and risking wounding and animal. Something 99.9% of us do not want.