OCD, it really doesn't matter where you start, just MAKE SURE you shoot the gun to verify reliability after the switch. Personally, after gun mods, I test with CCI primers, as they tend to be among the hardest available. If the gun shoots with CCI primers, it should be OK with everything else. I also test with my carry load, but I start off with CCI and have never had a problem with this process.
I've never changed out springs in my SP, but I did play the spring game with my S&W M649. I also bought the Wolff spring kit for it. I can't remember what the weights were, but IIRC it also came with 3 mainsprings and 1 rebound slide spring, similar to the trigger return spring in an SP. I started out with the lightest and THANK GOD I tested it. None of the Wolff springs would reliably set off a primer, so I ended up back with the factory springs for reliability. Because of this, I haven't touched the factory springs on my SP, I just "tweaked" the innards for smoothness and practiced for the trigger pull weight. This is why testing is so important- imagine REALLY NEEDING the gun and it won't go off! Dead or injured OCD!
Bub
I've never changed out springs in my SP, but I did play the spring game with my S&W M649. I also bought the Wolff spring kit for it. I can't remember what the weights were, but IIRC it also came with 3 mainsprings and 1 rebound slide spring, similar to the trigger return spring in an SP. I started out with the lightest and THANK GOD I tested it. None of the Wolff springs would reliably set off a primer, so I ended up back with the factory springs for reliability. Because of this, I haven't touched the factory springs on my SP, I just "tweaked" the innards for smoothness and practiced for the trigger pull weight. This is why testing is so important- imagine REALLY NEEDING the gun and it won't go off! Dead or injured OCD!
Bub