Pale Rye malt??

[beer gut]

Hi everyone i hope you are all well.I would like a little advice on pale rye malt, iam going to make Rye stout but iam not sure on what is the maxium amount of pale Rye malt i can use in my grain bill.One site says you can use a max of 50% in your grain bill yet hop&grape advice is you can use up to 20% of Rye malt in you grain bill.I know why you can't use 100% pale Rye malt in your grain bill and that reason is Rye does not have the same Enzeme power has Maris otter or other base malts.So if i can find out what is the max % of rye malt i will know how much base malt to add to help the convert the enzeme sugars in the Rye malt,

[Invalid Stout]

It's not the diastatic power that's the issue, it's that that rye is very difficult to mash due to not having a husk, and produces a slimy wort. One German brewer who used 60% rye had to develop a modified mashing regime to cope with it.