Nontoxic turkey loads

[Mr. 16 gauge]

I haven't hunted turkeys too much in the past; just a time or two......so I know just enough to be dangerous!

The area I put in for for turkey permits this year encompasses an area of wetlands. Last winter, while turkey hunting, I came across some turkeys & turkey sign.......LOTS of turkeys & turkey sign! I'm thinking about checking this area out thoroughly if I get drawn this year, as I don't think too many folks will be hunting it for turkeys (looks more like a duck area than a turkey area).
At any rate, the lead turkey loads I've developed will be illegal to use here, so I am wondering if there is anyone out there who has hunted a lot with nontoxic shotshells. MI law decrees that no shot bigger than #4 can be used, so that rules out my hevishot reloads (#2s), which would have been my first choice. I was at Gander the other day and they had some Remington HD (3"- 1 5/8oz- #4) on sale...5 rounds/$8 :eek! I also have some older factory loaded bismuth (3"- 1 3/8 oz-#4) I really don't have enough shells to do some extensive pattern testing like I would like to.
Which do you think I should go with? I'm thinking the HD because it is denser, but would like some other opinions.
Thanks in advance.................