Heh. Shoulda known, but they didn't offer them in the past.
My '82 was hard on my wrist last time I shot it. Judging by the breachface, it's been shot A LOT.
So I ordered the 16.5 pounder. Wolff says 14.5 pounds is the factory.
They also offered an 18.5 pounder. We'll see how it shoots.
I would imagine that you don't want to go too heavy, since the heavier the spring is, the harder it's going to slam the slide into the frame with every shot. That, and most ammo I shoot is standard Barnaul Brown Bear or Silver Bear.