ORIGINAL: DVanVorous
When one unloads a .54 Kodiak with a CO2 unloader after an overnight and day hunt worth of time, and on finding a "chunk" worth of a full charge thats the same shape as the breech, one can pretty much assume that the powder absorbed moisture. Might add that the overnight and the days were classical CA sunny summer days, i.e. no rain over the period.
Combine that with the folks at Hogdon stating that it will absorb moisture since they released it in the 70s. Im my book thats more than enough for me to state the stuff absorbs moisture.
Anybody having shot BP knows that moisture degrades powder resulting in variations in velocity, be it Goex, Pyro or what ever. Thats information thats been confirmed since forever.
Now iffen folks opt to work from the same can over extended time thats their perogative, but it doesnt change the fact that the substitute powders are all hydroscopic and will degrade.
The 'chunk" at the breech could of occurred withreal blackpowder also. It also has the ability to absorb moisture from the nipple. The difference between the subs and real black is that real black can re-dry itself right inside the bore without degradation.
Folks have reasons why they prefer real blackpowders.
Other folks have reasons why they prefer a substitute powder.
Retail sales among hunters in this decade indicate a clear preference for substitute powders. I use both & have no personal preference overall.