You guys are missing the point, which will also explain S&W's position.
The 9mm luger barrels are designed to hold Saami pressure limits of 38,000psi, with a 35,000psi average expected load.
+P loads are tested to 41,500psi with an average at 38,500psi.
SAAMI
+P+ loads are ANY load beyond the +P limit. They could be 10,000,000,000psi. The sky is the limit because there is no standard. When you ask S&W if your gun can handle loads that could be really hot, what do you expect them to say?
So the place to ask your question is the ammo manufacturer. They will know the pressures their loads are producing.
Then maybe ask S&W how they feel about 30 rounds of 42,000psi loads (or whatever ) running through the gun every year.
Chances are they will still CTA, but at least you will know what pressures your rounds are putting out.![]()
Thanks, I tried to point that out in an earlier post, but people blew right past what I was trying to say. You did a much better job.
Asking a manufacture to approve +p+ is asking them to approve shooting anything you can cram in the chamber.