If you are happy with the patterns from the new Federal loads use them. If I remember correctly from another post you had the wad bouncing off the target and were worreid about close shots. I have had gunners shoot several turkeys at under 15 yards. Of course any turkey choke will be tight at that distance. What do your federals do? Are you essentially shooting a slug, or has the shot left the cup? If you like the close pattern as well as the distance pattern stay with what you have.
That said I have been using the Remingtom heavy shot loads for a couple of years and have been very happy with thier patterns and kills. I have not seen a bird hit with the stuff twitch after going down. Shots have ranged from 20 to 45 yards. The 45 yard shot had one pellet in the spine and I cut its throat to finish it, but it never flapped or moved after being hit.