I've got a Colt Gold Cup 70 Series National Match, bought brand new in '72, I've shot just about every kind of loads thru it, including a bunch of hand loads, and have never changed the springs that came with it. It still shoots every kind of ammo imaginable. I've got buddies that also bought the gun and have changed springs, for exceptionally light loads, and the heavier loads. To be honest I've never been able to tell the difference, with the springs it came with. Note I carried that pistol as a law enforcement officer for 16+ years also.