Of the three chokes you have... If you get Nitro straight 7's, try the JH .660... If you get 4x5x7 nitros, I'd go with the PG .670... Choke exit diameter is only a portion of the pattern equation... The IC .665 does well, but better with straight 7's than the triplex nitros in my 870...Just because the IC has a tighter ED doesn't mean it will provide tighter or more even patterns.