Thanks Steve and pamtnman.
This weekend I chronographed a dozen 10 bore 3.5 and 4 dram loads with 1.25 and 1.5 oz shot, trying both Goex F and FF in RMC shells with lubed fiber wads. The Pro Chrono works fine for nitro loads but I got nonsensical readings for half the BP shots; the other six were in the 950-1000 fps range, with loads that should yield around 1200.
Two questions: 1) I have not found instructions for chronographing BP shotgun loads and would be grateful for advice; and
2) given the poor reliability, I have no idea if the 950-1000 readings are accurate. If they are, could the low speed be a result of using Goex rather than a higher grade BP?
