I need a scope for my 223 Ackley. I think I have narrowed it down between a Nikon Monarch 3 4-16x42 Side Focus BDC or a Vortex Diamondback HP 3-12x42 Riflescope Dead-Hold BDC Reticle. I own two Vortex scopes already, a vortex HS LR and a regular Vortex HS. I like them both. I also own a Nikon Monarch with a mildot reticle but not a BDC. I honestly can't tell the difference in quality between the two and I am pleased with both. I have never looked through a diamondback though so I am not sure if their quality is as good as the HS line is.