I have read that the SWK standard is virtually identical to the FC 16oz.
And I recently bought a heavyweight from SWK and if I had to venture a guess I would say it is 16oz wool as well.
I could be wrong but I hope this helps
edit: while I was typing a differing answer has been posted. 
edit2: And after reading the Wizards review it seems that I am pretty far off base. Good thing I never claimed to be the expert eh?
Last edited by Spc. Scott; 23rd July 08 at 10:06 AM.
I have always tempered my killing with respect for the game pursued. I see the animal not only as a target but as a living creature with more freedom than I will ever have. I take that life if I can, with regret as well as joy, and with the sure knowledge that nature's ways of fang and claw or exposure and starvation are a far crueler fate than I bestow. - Fred Bear
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