I use the Bushnell banner scope with the mechanical BDC (bullet drop
compisation). The vertical turret you dial in the distance. You dope the scope. It goes from 100yards to 500yards with no error. You install the dial ring to match the bullet weight your using. It's for a 30 caliber rifle 308/30-06. I refuse to use anything else but the mechanical turret with the BDC option. I use the Bushnell older model scopes with this mechanical BDC option since '94 with no problems. All my 30 caliber rifles have this Bushnell scope with the BDC option.

BSA offers a BDC TURRET scope for the 223.

I will never use the cross hairs with the distance dots. There not adjustable to your bullet weight. So it's not exactly correct for the bullet drop.