Been reloading a bunch of .40S&W and having trouble with the Dillon decap pin not punching out all the primers. It happens maybe once every 5 to 10 rounds. Brass is mostly Federal or Speer nickel and happens to both. If I remove the brass, index my 550B forward and re-insert the brass, I can cycle the reloader two to three times before the primer gets punched out. Pin is not bent, die is adjusted to make contact with shell plate and all is clean. Is it a weak spring on the decapper?