I had a similar problem shooting some hot reloads, only not quite as bad. The ones I shot just compresses the spring to the point it would not eject the shell.
My friends grandpa (who does all of his own gunsmithing) had some springs from Brownells that were the same diameter, so we cut it to length and installed it. It works like new. Unless you have something on hand like I did, I would just contact Savage and get a new spring.