Played with some 180 gr Bergers coated with Danzac in my 7STW on the weekend. The throat for this chamber was cut very short. It was set up so that a 150 Scirroco would fit the magazine and be just into the lands.
I was shooting 76 grs H-1000 with a Federal 215M primer. Three shot groups measured in the mid .3s at 100 meters