800x value?

I came into afew lbs of 800x, what is the value of it or can I use it to reload slugs in 410g ?
Plenty of good powder and load data for .410 out there 800x isn’t one of the powders used though. With shotshell you have to follow the data to a T as their is no signs of over pressure till it’s too late. Hull primer and powder and wad have to match the recipe.
 
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