Don't let anyone discourage you. I have used itx succesfully for 2 years. It is good stuff and cheaper than Bismuth. I would suggest using 7/8 or 1 oz unless you decoy them in close. #4's work real good. #6 for teal work fine and you can get by with less shot.
BP does have some low pressure loads in their manuals. If you need them, PM me.

I have used both 2 3/4" and 3" shells. 1 1/8 oz in 3" in my LC Long range will take ducks to 60 yards, if I do my part. Don't normally like to do that, but I chased a duck last year to at least 60 and he dropped like a rock. (I have a witness)

BTW I think roll crimps can raise pressure.

Jerry