Need Choke Reccomendations

[Chilly]

I am wanting to improve the pattern on my Rem 1100.  It has a 21" barrel and the forcing cones have been cut.  I have a .570 Remington Turkey choke for it now.  I am wanting to shoot Federal HW in 3" loads #6 or #7 with 1.5oz of shot. 
From your experience or what you have seen, what choke would you reccomend for these loads and this combination?

[gophert]

What does the .570 look like? 

[Chilly]

It puts about 100 pellets in the 10 using the 6's.  I just feel like I should be able to make it do better than that. 

[gophert]

I would say that with 7's the average would be right around 130 so I don't think you are too far off with those 6's. 

[Chilly]

Just wondering how much a sumtoy would help?  I see that a lot of people on here are shooting one of those.

[R AJ]

In #7s a Sumtoy may increase by 40-60 pellets, maybe more , maybe less but definitely better pattern density and pattern coverage. Get the 562-5 for the Fed HW #7 load and the 562-3 for a Hevi-13 #7 load.

This choke can also give some really strong lead patterns at 30 yards in #6 Federal FC or pre flite conrol loads. Definitely a good choice and pattern.

[WyoHunter]

Carlsons .575 choke works well in my Beretta Urika 20 ga with Fed HWT 7's.

[wmd]

May not help at all, but you won't know unless you try it.  I have not shot a SumToy, but I have two 1187s with 21" barrels that I have shot every commercial HTL shell out of with various chokes.  In one I shoot a .562 Hastings and get over 160 with Fed HW 7.  Same choke/load in my other one blows the pattern and will sometimes barely break 100. I tried progressively more open chokes and finally stopped with a Carlsons .575.  With the HW 7s I get around 150 and with the HW 6s the best I got was 117.