South Texas Dead I---
In the Wolfe spring website or catalog, I believe they tell you what the factory weight spring is for a specific handgun. Let's say the spring for your gun is listed at 19 pounds. Then, it's a matter of buying a spring of perhaps 17 pounds and see how they function with your loads. If the shells dribble out, the spring is too heavy, if they're thrown into next county, the spring is too light. It's also a good idea to mark your springs so you don't get them confused or mixed up.
Int'l Assoc. of Law Enforcement Firearms Instructors