I also shoot a 12 ga 870.Over the past 22 seasons I have shot lots of combos.Started with factory turkey and lead 4's{federal}.It was a great combo,then a few years later I learned to use the interweb.Of course that changed everything but turkeys were not any deader.I now{past 4-5 seasons}use a Pure Gold .670 with Federal Heavyweight 7's.It has been explained to me by ballastic GuRu's that the Federal 7 has the same down range energy as 5 lead,with lots more shot.I want a good killing pattern for a wide range of distances.A load that puts 90% of its pellets in a 10" circle at 40 yards will be easy to miss a 15 yard in heavy cover.For me this shell/choke combo suits me perfect but its likely my 40 yard paper targets would not be impressive compared to some I see posted,but I do have alot of dead turkey pics.