I have the 3" Vinci, great gun, and have had excellent results with 3 different chokes. The Wright's #3, the SSX and the Hevi-13 turkey chokes have all produced great results with Hevi-13 "Bronze" shells with 2 oz. of #6 and #7 shot.
Cleaning that barrel, even when brand new from the factory, is very important to optimum results for turkey hunting. It will just keep on going, even when very dirty, great for waterfowl, upland, etc. but for turkeys, it needs to be "deep cleaned".
That gun has less muzzle jump than any I've shot and really allows for a very quick second shot.
Thanks,
Clark