When you buy certain Luepold scopes you get 1 free dial, not all Luepold scopes come with that option. Mine did come with the free knob, I gave them my load data and out to 500 yds it is dead on mounted on my 270. It took just over a week and I had it back.
I just ordered a Kenton knob for my Vortex last week. I will update when I get it back and get it tested.