I know every gun shoots different, and I also haven't shot the pure gold in anything but my weatherby and an 870. The 555 tempest put up 95 to 110 type patterns with federals in both guns. The 570 tempest, and ported 570 did about the same 95 to 110 at 40.
I did shoot one Hevi 13 7. I seem to remember it being a slightly better pattern...like in the 120s. I think that was the 570 tempest. Again, neither was out of an 1187 though.