In general, the more powerful the load the greater the need for a more powerful spring. Bullseye shooters with light loads will use the springs down toward the 10 lb range. I load my full-sized 1911 for IDPA and IPSC, both requiring power factors of greater than 165,000 (velocity times bullet weight) and use a 16 lb spring. The 16 lb spring is considered "stock". If you are shooting hotter or more powerful loads, then 18 or 20 lb springs will likely be needed.
There are two things to consider, the first being the most important- battering of the parts. The next is the speed & "slam" of the slide returning to battery.
There are two things to consider, the first being the most important- battering of the parts. The next is the speed & "slam" of the slide returning to battery.