Apologies for the thread drift, but people frequently mention overcharges of fast powder and the bad stuff that happens. I ran three Quickload simulations with a Hornady 148 gr HBWC in 38 Special. Charges were the classic 2.7 gr of Bullseye, and then a double and triple overcharge. Disregarding that the HBWC bullet may not survive intact, it seems the pressures could be contained in a K-38. Certainly firing the overloads should get your attention, but a kaboom is unlikely. Another thing, if the handloader is paying attention, a double or triple charge of Bullseye is readily visible in the case. Note the fill ratios. One just has to look into the charged cases. This is why I think it's unwise to charge a case and immediately seat the bullet. Charging all the cases in a loading block and inspecting relative fill ratios make a double charged case stick out like a sore thumb.
From Quickload:
Charge___Peak Pressure___Fill Ratio___Velocity
2.7 gr____5365 psi_______23.2%_____628 fps
5.4 gr____17697 psi______46.5%_____1066 fps
8.1 gr____37639 psi______69.7%_____1391 fps
