The 270 Redding is a mildly improved .270-08. It is very much in the same class the 260 Remington, 7mm-08, 6.5 Creedmore, et al.
While people might get within 100 fps of a 270 Winchester fired from a 20" barrel, keep in mind that much of the "data" for the 270 Redding comes from people that load it until the bolt sticks, back off a tenth of a grain and call it good.
The hard fact is the 270 Redding has a case capacity about 3% greater than a straight neck down. It hardly seem worthy of the fireforming.
Performance aside, the 270 Redding has a couple more issues. The increase in shoulder angle is partly achieved by pushing the neck-shoulder junction back. This is a recipe for doughnut issues.
In addition the shoulder is moved .050 forward. I don't have a magazine in front of me at the moment, but I seem to recall a rib inside the magazine just in front of the shoulder to prevent cartridges from moving forward under recoil. While you could modify the magazine to remove this rib, why do it for .050"? Why not .100" .150" or .200"?
A wildcat or boutique cartridge should be worth it's keep. I don't thing the .270 Redding is it. It might sell, but you'd be selling the sizzle, not the steak.