I didn't clock it, but think it's north of 2,800 fps, maybe not that much. You can push the 123 Scenar a good bit faster, but doubt you'd get better accuracy...
Regarding RL-16 vs. RL-17 discussions, here's Sierra's load data. Note that when RL-16 and RL-17 are listed next to each other, it takes a bit more RL-16 to reach the same velocity as RL-17. That would indicate that, at least in this application, RL-16 may be slightly slower burning than RL-17, sorta reversing the numerical burn rate order.
