I use Dawson Precision springs and followers in my 40S&W double column Para mag bodies with much success. Even with the extended magwells they have plenty of power to kick the last few rounds into position and keep the slide locked open on my last shot. I would imagine they would be more than enough if your using factory base pads. +1 on Wolff springs too, they are all I buy for most of my mechanical refurbs, quality stuff.

-Mike