That would be the one. .456 - 220 - 1R . Midway had them a little while ago, but maybe I got the last one. I am shooting 8.6 gr of Unique, with the bullet seated just past the last lube groove. I have 1.622" for an OAL. I am also using liquid alx for lube. This load is far from hot, but I do not doubt that it would do the trick on a deer at up to 50 yards.
I am casting with straight weel weights. I agree, this is probably like the .44 mag. I have one of those barrels, and I have not shot it yet, as I've been too busy messing around on other loads. I got a .357 barrel with the .44 mag for my wife to hunt with, but she still liked the 45 LC survivor, as it handles for her better. I think after shooting this well with it, she can hunt with this one.