ORIGINAL: heinz57
i use T7 pellets and never had a problem with my powder ...BUT i had a problem with my bullets ,i sighted in my muzzeloader in the summer [warm temperature] and at 100yards all of my shots went into a 2" circle ..went back to the range in the fall , temperature was damp and cold and i was shooting 12" low ...the DEAD CENTER BULLET sabot was not sealing enough in a cold climat ..[also noticed they were very easy to load ] had some HORNADY SST.250 gr. and was on target with them ,used same powder T7 .. so did u go back to the range and try a differant bullet ?????
Dead Centers in their supplied sabot seem loose in many guns to me. I have a tight bore in my Omega and they still go down easier than any other bullet, which is why I am going to try some with different sabots (as-is they shoot badly).
Go ahead and switch powders but I can tell you this is not common with 777, though I do hear reports of it happening and it happened once to me. I shoot a decent amount, so I just always use a brand new jug for my final sight-in before season and for that season, then finish it off the next year on the shooting range only.