[ARCHIVED THREAD] - BDC differences between 5.56 vs. .223

Posted: 10/12/2009 5:53:06 AM EDT

I've been looking at optics, etc... and see some have the recticle set for .223 ammo. is there going to be a significant differnce between factory loaded .223 vs. Nato 5.56 ammo. All variables being as equal as possible. 55grfmj -55.grfmj...
Will there be a noticable difference inside of 300 yards?

Thanks.