I've been looking at the NF 2.5-10x w/ their Velocity 600 reticle for an SPR type upper I have. I fed their on-line calc data for my .223 55 and 75gr loads and the LV reticle seems right on. Anyone messed with one of these reticles on a .223? Did u find the on-line NF calc accurate? Feedback appreciated. Thanks.