I wish that I could get a definitive answer on this one as well. Not so much for snare kill springs but for my 330's.
I don't set my springs on my 330's until I use them but always end up with ones that don't catch beaver. I've been easing the springs on them because we always eased all springs in the Army due to the possibility of the springs weakening. We even took our ammo out of the magazines so as not to weaken the spring inside. Unless I can find something definitive that tells me not to do it, that's what I'll continue to do. Besides, if a spring is going to fail I want to know about it when I'm setting the trap for use and not be the cause for a bad catch. Just my opinion and nothing scientific about it.
