Noticed that the BB load was said to have just 7.5 grs of powder in the load.

On 5/23/2013 I pulled the trigger three times on my M49
snub nose with a 158gr Lswc and did not fire the last two....
the chrony read out 912, 944 and 970 fps. Recoil was Heavy.
The load had a heavy crimp and standard cci 500 primers.
This load was the maximum load of 7.5grs BLUE Dot, per Alliant data.

With a very heavy crimp it may reach the 1,000 + fps........
but not in my J frame revolver!!

My final test with BD will try for 830 fps and be hopefully under the 18,000 cup pressures for the little J frame.