I still have not had a chance to use my BH209 yet. i have always used 777 in my in lines. i will say that i soak my BP with 777 and spend quite a bit of time with a small pipe type cleaner making sure it is clean. i "DO NOT" like the crud ring created by using 777 at all. it is very time consuming and a pain in the @$$. then there is the second shot scenario,that can possibly come into play. when using 777 i just can't see having the time or items available for one.as far as moisture i haven't experienced that problem.i also do not consider 777 to be a substandard powder. then there is the cost difference, which can be substantial to someone who is constantly shooting there rifles. the decision to use any of the various BP sub products is a personal one. Ray