Don P, if I were the OP then even if I were willing to own full responsibility for creating the overload, I would still send the gun in, admitting the fact, and offer S&W the opportunity to check it for metallurgical issues.
To each their own. I don't see the necessity of wasting S&W's time. A fellow shooter destroyed his M&P 40 S&W. he double charged the case and knew exactly when he did it (after the fact). I was with him when this happened Blew the magazine out of the gun cracked and bulged the frame beyond repair. barrel and slide held with no visible damage to the naked eye. On a polymer gun what good does sending the gun in for metallurgical issues accomplish???