Had what I believe to be the same scope, in fact, I had 2 of them, both purchased from Cabela's. I also had some Vortex and Weaver scopes with BDC reticles. One of the Nikons was on a 300 Win Mag firing 180 grain Barnes TTSX. I sold all the BDC scopes and replaced them with Duplex reticles. Two problems with the BDC scopes [just my opinion]. First, if you are shooting a 300 Win Mag, you're probably not shooting at prairie dogs or ground squirrels. You're after elk or bear or large mule deer or big pigs, all of which have a pretty large vital area. The BDC system, if you are in a hurry, is too much clutter, again, just my opinion. A simple duplex reticle, zeroed at about 275 yards with the 300 Win Mag, will kill any big game out to about 350 yards just by putting the crosshairs where you want the bullet to hit. And if you jump an elk or a bear or a big pig at 20 yards, try putting the BDC scope up to your eyeball and figuring out what the hell to do with that array of circles, dots, and hashmarks, all in about 2 seconds. The second objection I have with BDC scopes is that even after you plug in all the necessary data---your bullet [caliber, weight and ballistic coefficient], the muzzle velocity, and the elevation of the place where you're hunting---the damn bullet is going to do what it wants to do and you may find that you're off by 3 or 4 inches when you use the various little dots, circles, or hash marks for distances beyond where you zeroed.
If you're hunting big game, a BDC is OK if you have plenty of time to fiddle with the turrets and figure out all the little marks in the field of view. I'm no expert [don't want to sound like the infamous Larry], but I've taken about 250 big game animals under all sorts of conditions and another infamous character, Murphy, is always standing right beside you.
With big game hunting, simpler is better. Again, just the opinion of an old fart.
Now that you have the BDC scope, be absolutely sure to verify where the bullet impacts with each little circle, dot, or hashmark.