Ran a batch of Underwood 165 JHP on the range today and am spooked on the brass!

[RMM]

I have had a few "hot" Underwood 165 and 180 TMJ & JHP rounds myself.
Out of the 150+ I've fired, only one really smiled bad (the one in these pictures).  I have 5-10 that have light creases... the rest I have reloaded 4-6 times each at full power (but not nuclear) levels and they are still holding strong!  The only way I can justify this is that there are a few that slipped through with a little extra 800x, being the wonderful powder it is to meter and all.

[tmwtrfwler]

just as a follow up since i've been mia on the web recently.  ran a box of underwood 180 tmj's sunday and they were gtg. love this gun.

[pghjim]

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.

[The_Shadow]

pghjim, Welcome to the forum!