In a 358 a douglas #2 is going to be pretty lightweight, a #3 is will be normal sporter like and a #4 will be a little heavy/weight forward. This based upon a 20" unfluted barrels. My guess is a fluted #5 is going to be a little heavy although would work great as a tree stand or blind gun.
For a general walking about gun I would do #3 or fluted #4. As a rule I would prefer to have a small cylinder say 1" to keep the weight down and forward.
As Stick says every maker seems to have his own lists of contours, my numbers would work for a Douglas contour, you can look up the profiles and compare to the barrel manufacturer of your choice.
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