You've got a slightly lower BC - but I must admit that Berger has made yet another very worthwhile step forward with the 0.224" 80.5gn BT compared to when I ran the original numbers for what was available at the time I went down the .223/90gn route.
However, I just don't think that the .223R user can get an 80 to the same MVs as some national league competitors are running 155s at in their 308s. Think numbers around, or beyond 3,100 fps!
You can get the 90gn Berger VLD to shoot well at long range, but it's very hard work. My 223s' barrels so far just haven't taken to the 80.5 unfortunately - a shame as I'd like to be able to use this model. I'm using the 90gn Berger BT instead in the 'affordable' 223 F/TR rifle at a relatively modest 2,600 or 2,650 fps from a 26" barrel. At its peak, my long-range F/TR 223 and its 31" barrel produced 2,907 fps and low teens ES with the 90 VLD, but that was pushing it, and a really hot summer day would have produced serious primer problems. 2,850 with VarGet was less risky and less temperature affected. Using the 'Litz Rule of equivalent ME values' for different bullet weights produces an ME of 1,689 ft/lbs for a 90 at 2,907 fps and that equates to a respectable 3,073 fps for the 80.5gn bullet - assuming there is an accuracy node at that MV of course. The more 'sensible' 90gn MV of 2,850 fps has an 80.5 equivalent of 3,013 fps.
I have seen people produce some frightening MVs with the 80.5 in rifles with RPA 4-lug actions, but none I've seen so far would group under an MOA at 100yd at these same velocities. If you can get significantly above 3,000 fps with the 80.5 and with the quarter MOA grouping that I could get from the 90 VLD, congratulations ...... and be careful you don't waste barrel life in anything other than major competitions as you may not repeat the feat with its successor. There seems to be a bit of a lottery with long-range 223 at present. Some barrels perform outstandingly giving the right MV / grouping combinations, many simply don't. I live in hope that somebody will discover just what combination of groove numbers and form / internal dimensions gives the right results consistently which could really assist the cartridge's long-range use. It'll never seriously compete with 308W though in the popularity stakes as the latter is simply so much easier to get good results with, and so much less likely to go 'out of tune' for some inexplicable reason or other.
Anyways ... we're rather off-topic here, but this exchange does emphasise the principle that I believe in 100% that almost anything should be allowed in F/TR as long as the rifle chambers .223 Rem or 308 Win and complies with the regulations such as the 8.25 kg overall weight. To give an example of the radical thinking around, I heard a well argued case for re-adopting iron match sights the other week to allow the weight saving over a scope to go into a yet longer / heavier barrel. Some of the top ex TR riflemen can hold a circular aiming mark so well in 'irons' and adjust windage on the knob between shots that it might just work out very well! Vive l'experimentation!