Talk to Bobby Branton. he moderates the thrower forum, as well as being the dude who is in charge of making all of those ATC hawks. I won a thrower in a contest he held. he could tell you TONS of info about throwers. He is the prez of the largest throwing club thingy in the US as well, so he really knows his stuff.
My thrower is 5160, but I don't know how hard it is.
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"Come What May..."