While I own a 686 and not the GP-100, I was torn about which length to choose too.
I ended up going with the 6". While I don't hunt with mine, I do a lot of target shooting, and I like the extra heft of a 6" barrel for range use. In my opinion, it soaks up some of the abuse that comes with shooting heavy 357 loads.
From what you've mentioned your intended use of the gun will be, I'd recommend the 6" barrel.
I'm thinking the same thing as Sevens though, what I *really* want is a 5" barrel–the best of both worlds!
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