I'd like to change the recoil spring in my Kimber 10mm. My brass gets thrown about 20ft with handloads and even farther when using Double Tap Ammo. The factory spring is 18# I'm told. Any opinions on what weight I should start out with?
Get a few strengths, start with the heaviest.
If there are any malfunctions, move to the next lower.
Keep moving down until you have the heaviest that will still function 100% reliably with the ammo you use.