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5" 1911 .45 ACP, OEM 16lb recoil springs, one fresh out of the package and one at ~4000 rounds, primarily standard pressure factory 230gr FMJ but more than a fair share of 230gr +P HST & T-Series. Weapon ran 100% with the used spring.
http://i140.photobucket.com/albums/r...oe/Recoil1.jpg
Moduli of plasticity and elasticity, how do they work?
Proof of theory that as things get older, they get shorter!
It's always pretty cool when you replace all the springs. Feels like a new gun.
Just like you don't notice your horsepower slipping away until you get a tuneup. [Driver]