I'm looking forward to the new bullet. I can't imagine a company exchanging an existing decent line for another that is lesser in performance, especially considering that the plating process doesn't seem like a method that will expedite product delivery. Speer has surely done their homework unless they really don't care if their ship goes down - which I seriously doubt.
I have always been happy with the Uni-Cor line of bullets they sell and use them in the SP versions in their large bore revolver bullets as well as the 45-70. In these forms, they have always worked better penetration-wise than the Interlocked and standard XTP bullets offered by Hornady. I would imagine a heavier jacketed version for higher speed loads will perform well also. I just hope they can deliver their product at a price that doesn't rise significantly after initial introduction - like Interbonds did.
This was a side-by-side, wet newsprint test of two highly reputed bullets alongside the 300 Speer Uni-Cor for 45-70:
300 grain bullets. Swift A-Frame for 375 H&H, Speer (middle) and Nosler r. for 45-70. Swift: 2560 fps, 287 grains; Speer: 2450 fps, 203 grains; Nosler: 2432 fps, 237 grains. All fired into wet newsprint. Swift 18", Speer 14", Nosler 26 1/2"
These are 300 grain revolver bullets fired from a 45 Colt revolver at approximately 1150 fps. They were fired through the bone ends of the long leg bones of a mature moose and captured in wet newsprint. On the left are the XTP-Mag; next-top is the Sierra SP; the two below, also in the second column, are two 300 Speer SP; next two RCBS cast; finally two of three standard XTPs. (One of the standard XTPs was rejected by the heavy bone and not recovered.)