Black Powder loads

Well, here it is and it weren't easy. As you might guess, the smoke-fire-brimstone from the black powder gets to the photo sensor of the Chrony about the time the bullet crosses the stop sensor. Results in an erroneous, if any, reading. Only practical way I found to acommodate this condition is to use Saran Wrap to block the dregs of Black powder, yet allow the bullet to pass. Works just great! In the picture, you can see the haze on the first sky shield that is caused by the Saran.

Chrony results 7/26/06, 10 feet from the muzle '73. Readings in fps.

1. 971
2. 882
3. 926
4. 928
5. 956
6. 940
7. 933
8. 924

SD 25.5