Don' t know of any websites, but here' s what I have come up with at my local range:

CVA Bobcat .50 cal. 1:48" twist

Speer .490 RB
.015" TC lubed patch

80 gr. Pyrodex RS

Muzzle velocity: 1691 fps
energy: 1124 ft/lbs

60 yd velocity: 1212 fps
energy: 577 ft/lbs

Approximate drop at 60 yds.- not noticable with a 3" group

Conidtions: Elevation- 5100 ft., Wind- none, Temp.-95 degrees.

Yes, I did set my chronograph out at 60 yds and shoot through it. Will do some more testing with different bullets in the near future, hope this helps.