I don't recall ever shooting a .655 Jellyhead out of a Stoeger 2000.
If you want the very best go with Nitro hevi straight #7's with a .660-.665 Indian Creek, Pure Gold, Jellyhead, or Rhino.
The best (most consistent) lead load that I have found are the Winchester HV's 1.75oz #6's usually out of a .650 choke.
If you want to go with a very nice consistently good load the Hevi-13 3" 2oz #6's with a Indian Creek .665 should be nasty out of that thing.