How does the ambient temperature effect/affect the dependability of low pressure smokeless loads? And secondly, how does it NOT effect black powder?

I have always read that cleaning doubleguns shot with BP was easy. Just remove barrels and flush with hot water thouroughly and coat with your favorite protectant. Is that accurate? If so, how do you clean a pump gun properly if the barrel isn't removable? Pour the hot H2O in from the breech?

Joe, Thanks for the reference to the DGJ back issues. Can they be purchased off of this board? This topic fascinates me to no end. I have several guns 100+ years old so this info is definetly a subject I want to know about. Once I learn enough about it... I'm afraid they'll outlaw lead all together and then all the useable loads will be obsolete.