Twice through grinner, snug it down carefully.
Powerpro's the best braid I've used, beats Fireline into a cocked hat, twice as strong for same dia and it doesn't seem to go furry.
The ones to avoid are the flat profile lines like Whiplash. Fine for using on a multiplier, hopeless for a fixed spool as you get wind knots with the slightest amount of line twist.
The 50's fine for smaller lures like spoons etc. I use it for some bait fishing like river stuff but would go up to 65 for bigger lures, fishing big baits etc.
I've had unexplained breaks on fish with both Whiplash and Fireline.
Powerpro nil problemo touch wood.