I'm not trying to take the **** out of anyone here, but:
Why are you paying for .20 Tactical brass? This cartridge was specifically designed to be formed from cheap, easily obtainable .223 brass. For what is being shelled out for Dakota brass, a form die could be had, and pay for itself in the first few hundred cases.
I understand the desire for "vanity" brass, but there comes (in my mind) a point where the threshold of common sense is crossed. IMI and Lapua make very very nice .223 cases. I know Mil-Surp LC brass is next to impossible to get in the UK, but egads, I cringe when I hear about folks buying pricey brass and having more problems with it than those of us just forming it from bulk brass.
Perhaps it's just my perspective, being in the US(?). I have yet to pay anything for 20 Tactical brass, as I pick up LC brass off the military ranges I frequent, so maybe that's skewing my perspective as well...