I have heard ...
Welcome to the forum and do please do bring all your "I have heard" myths here to be busted. Of course there are some areas of gray and "two sides" of the theory, BUT A VAST number of "things one hears" with regard to black powder weapons and shooting are simply wrong.
To stretch/bend the metal, forces must approach yield strength. 12L14 is around 60,000psi, 4140 is the same according to AZO Materials.
Motor vehicles would need to be constantly re-fitted with new springs if your "theory of bending" applied to steel. Matter-O-Fact conventional springs just wouldn't work for any length of time-instead of the bazillions of cycles they actually do.
Don't be afraid to ask, but do know that some searches can find you the "hot button" stuff that we've gone over before. This might save some "exposure" and give service to great posts of the pasts.
Enjoy.
And the boys aren't foolin' when they say that they sometimes have to bend a bbl to achieve regulation. That's a fact Jack.