From my experience the heavy lead and plated bullets are pretty forgiving with slower powders pressure wise, I know 1911s dont last long when you start pushing them with stuff a lot hotter than 230 over 950fps but is it the recoil or the pressure that causes the damage. I know the spring weight changes the way you feel the recoil but technically with the forces involved the spring is mainly there to have enough ass to return the slide to battery after stripping a fresh round out of the mag. It seems like the biggest force would be the pressure on the slide between the bolt face and the locking lugs.