It all depends on how fast the bullet is going...

All bullets drop at the same amount of time...faster bullets simply travel farther as they drop...

Point blank range for the 7mm RM (3100 ft/s) is just past 300 yards, so you do not need a BDC for shots out to that distance...

My rifle is sighted in at 200 yards and I have the mil-dot scope marked out to 500 yards...furthest shot I have taken is 275 though...