Re: Nikon M223
U, You can use NIkon's SPot On Ballistic Program to dial in your BDC Scope to the 50 grain bullet's that you are currently using. Won't be a huge difference but every inch counts. Go to Nikonhunting.com, click Spot On Logo, register, it's all free to use. Be warned, you can spend a lot of time checking out all sorts of ballistics and atmospheric conditions!
Thanks for voicing your positive experiences!