i love the buckhammer slugs.
i shoot them out of my winchester camp defender. it has a screw in rifled choke tube.
iv`e tried all the rest, but the buckhammer is the best. at least out of my winchester.
these things are potent and accurate, and really thump.
last year dropped a big doe at 80yds and a six point at 20 yds.
to me they are a little pricy, but well worth the extra money.
as far as leading, i havnt noticed any.
try a box through your gun....i think you will be impressed.