Here's some tests done with the two powders. It's 3F but will give you an idea. tests were done by paia.
100 grns SwissFFF
1937 fps
1978 fps
100 grns GoexFFF
1681 fps
1729 fps
90 grns SwissFFF
1858 fps
1894 fps
90 grns GoexFFF
1571 fps
1636 fps
1666 fps
80 grns SwissFFF
1747 fps
1803 fps
80 grns GoexFFF
1490 fps
1531 fps
70 grns SwissFFF
1649 fps
1715 fps
70 grns GoexFFF
1412 fps
1443 fps
60 grns SwissFFF
1566 fps
1593 fps
60 grns GoexFFF
1270 fps
1361 fps