I do not disagree with what was said, I was not there.  However, I have shot hundreds of rounds of Underwood 10mm 165gr, which clocks out of my 4.6" Storm  Lake barreled G29 at 1,440 fps.  I have never had an issue.  They are hot, recoil is hard and they make a lot of noise, but no signs on the brass of high pressure.  On a Glock you can see high pressure by the primer flow into the striker chamber, which is OK, but it the striker mark starts to disappear that would indicate higher pressures.  Like I said, none of these were found.  In fact, that is my carry load in 10mm.  I have also shot over a thousand rounds of Underwood's 357 sig that are rated on the box at 1,475fps.  Out of my 4.6" KKM barreled G32 I have not seen any over pressure issue.  Yes they are at the top level of pressure and kick harder than any other 357 sig and are quite loud.  I also carry the Underwood 357 sig with the Sierra 125 gr bullet.  I am not saying that you did not have a problem with either a bad batch, or your gun does not match the pressure of the round.  I just registered for this forum to let people know about my experience.