If you're replacing the window why are you bothering to remove just the beading? Are you keeping the glass, but just changing the frames?
To remove the beading get a stiffish stripping knife and shorten it till there is only a couple of inches of blade left, then sharpen the blade so that it can fit in the miniscule gap between beading and frame. A junior hacksaw and a file will do the job.
I am replacing a window with only a small top opening with one that has a wide half opening to latest fire escape standards. This is because the room is now required for use as a bedroom.
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