Brent, the velocity on the hard wads was all over the place the first time:
472
906
736
1019
1011

With a mess like that, dunno what I would call an outlier.

And pretty consistent the second time:
1136
1136
1152
1171
1101

I have wondered about gas seals, but people must have gotten fiber wads to work pretty consistently when they were standard.

My initial attempts to measure velocity of BP loads yielded no results, presumably due to the mass of ejecta confusing the chrono. I have built a funnel to reduce the possibility of flyers hitting the chrono (again), and will see if that helps with BP loads.