Well shot the Magnum Blend hevi-shot today and seems to work fine. I am probably going to buy a choke that says it is made for the hevi-shot just to be safe. At 25 yards it was a really nice pattern. At 50 not so good, but still enough shot to kill a turkey with a head shot?
I did open a ticket with them but was also looking for feedback from the forum if someone else was using this setup etc. I did hear back from Mossberg today. They stated "The blended shells should be OK. Shoot a few rounds for testing and verify that you are not getting a large amount of lead...
I just purchased the Mossberg 930 Turkey Edition that comes with the Accu XX Turkey Choke. The manual says that you can ONLY shoot lead shot of this choke. The choke is .670. I don't plan on shooting steel or Tungsten but not sure if the loads, such as Magnum Blend and Winchester Supreme Elite...