New to straight razors, forgive me if this is insulting but I only have any (very limited) experience on a double duck. My understanding is it's full hollow. I inherited the razor but have been considering getting my own once I feel I know enough about everything. So one thing I've wondered is what do the different grinds actually do? Half hollow, full, wedge, I know what they are but what's the purpose of one over another? I see some of these custom blades and just drool but don't understand much of why they are how they are.