Here what TAP is telling me. For arguments sake I'm using the top end number 323fps as well as 331fps (bare string +8fps).

@ 323fps
30" 60lbs 540gr = 250fps 75KE
30" 70lbs 540gr = 267fps 85KE

@331fps (bare string)
30" 60lbs 540gr = 256fps 79KE
30" 70lbs 540gr = 273fps 90KE

I have found TAP to be quite accurate w/in 1-3fps, take them for what they're worth. If you look at the low end. 315fps & 323fps (bare string).

@ 315fps
30" 60lbs 540gr = 244fps 71KE
30" 70lbs 540gr = 260fps 81KE

@ 323fps (bare string)
see above

I would say 260fps w/ 500gr+ arrow should be easily attainable in my opinion and if the cam is more efficient then these numbers could be higher.

These numbers are based on theoretics no actual testing will be done, hopefully next weekend I'll be doing some testing with my 30" 60lb Old Glory.