I've read somewhere that the deal with Remington has fallen through and the Spartan doubles will be distributed by someone else. For the life of me I cannot remember where I saw it. If I find it I will be sure to post it here. Given the elapsed time and the run around from Remington I doubt they will ever appear in the US via Remington.

On a good note, appearently, Hornady Ammunition is working on a 450/400 factory loading. Rumor also has it that it is being developed for the Ruger #1. I'm pretty sure I saw that on AR. If this is true, the smart manufacturer would develop an affordable double for the Hornady load. CZ already has suitable actions so it would be possible and easiest for them. I guess we will have to wait and see.