30#
I know this method of putting braid on a reel won't work for everyone cause not everyone has a spare reel that they are not using.
I used to have the problem with braid digging into itself when pulled really tight so when putting braid on a reel, instead of running the braid through my fingers, and hoping the braid is going on tight enough, I will put the braid on a reel with a larger line capacity than the reel that I want to put the braid on.
I will then put the rod/reel with the braid on it, on my bed, and then tie the loose end of the braid to the reel that I want to have the braid. I adjust the drag on the reel that has the braid on it so that when I am reeling the other reel, the braid is coming off with a lot of constant resistance. You will know if your drag is too tight when you start to pull the one combo off of your bed.