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