frankge Posted March 22, 2021 Share Posted March 22, 2021 (edited) Had to replace my Grandmaster's 9mm Trubor barrel after a squib did it in. Replaced with another Trubor with Brazos Thundercomp 2 . Noticed primers are now showing a slightly "domed" appearance now. These are with 124 Plated Xtreme HPs with 8.4 of HS-6 and Rem 5 1/2 primers (1.165-68). Same performance across the chrono, seem to shoot the same in a match. Next set of loads will be dropping the charge down a bit. Experience with Rem primers, or is it just the newness of the barrel? Edited March 22, 2021 by frankge Link to comment Share on other sites More sharing options...
frankge Posted March 22, 2021 Author Share Posted March 22, 2021 ...Trying this in the reloading section Had to replace my Grandmaster's 9mm Trubor barrel after a squib did it in. Replaced with another Trubor with Brazos Thundercomp 2 . Noticed primers are now showing a slightly "domed" appearance now. These are with 124 Plated Xtreme HPs with 8.4 of HS-6 and Rem 5 1/2 primers (1.165-68). Same performance across the chrono, seem to shoot the same in a match. Next set of loads will be dropping the charge down a bit. Experience with Rem primers, or is it just the newness of the barrel? Link to comment Share on other sites More sharing options...
mscott Posted March 22, 2021 Share Posted March 22, 2021 I’d say you need to post a picture as I’m not sure what a “domed” primer looks like. Link to comment Share on other sites More sharing options...
Steve RA Posted March 22, 2021 Share Posted March 22, 2021 Probably slightly bulged up in the middle. Link to comment Share on other sites More sharing options...
ima45dv8 Posted March 22, 2021 Share Posted March 22, 2021 Topics merged. Please don't cross-post in multiple sub-forums. Thanks... Link to comment Share on other sites More sharing options...
frankge Posted March 22, 2021 Author Share Posted March 22, 2021 (edited) maybe domed is the wrong term, looks like a slight crater and then a little bump up. Doesnt look like any gas is escaping past the primer and eroding the breechface Edited March 22, 2021 by frankge Link to comment Share on other sites More sharing options...
Guy Neill Posted March 22, 2021 Share Posted March 22, 2021 The primers are cratering. A sign of high pressure. That they are doing it in the new barrel and, I'm assuming, not in the old barrel indicates the new barrel may have a tighter chamber or shorter throat. Link to comment Share on other sites More sharing options...
frankge Posted March 22, 2021 Author Share Posted March 22, 2021 I figured as much, running Remington 5 1/2 primers - didn't think they were known to be soft like Federals as they are recommended for .40 and .357mag. 9 Major is pretty much high pressure all the time in my experience. Not looking forward to decapping a s#!t load of ammo I have made up already. These are actually the worst looking ones, most are just flat like they normally would be. I could switch to SRP's that I have but I'm of the school that they just hide over-pressure and sometimes let gas out. Link to comment Share on other sites More sharing options...
Don_B Posted March 23, 2021 Share Posted March 23, 2021 Check to see if the firing pin is the correct size for the firing pin hole. This was a big problem years ago then firing pin holes and firing pins were standardized with firing pins that fit snug in the hole. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted March 23, 2021 Share Posted March 23, 2021 Hello, I would plunk test your rounds to see if the barrel needs to be throated. Thanks, Eric Link to comment Share on other sites More sharing options...
frankge Posted March 23, 2021 Author Share Posted March 23, 2021 did the plunk test last night, no problems. Regarding the firing pin hole, deep river customs went through the gun when the new barrel was put in, I'll trust that it was done right. I'm not too worries with some over pressure using SPPs as like I said, most look ok. My new batch will get less powder though and re-chrono. I would think as the barrel wears in a bit that will alleviate the issue somewhat. I'll shoot the new batch first then use up the others which I have ~1000 so I really dont want to decap and reload. Link to comment Share on other sites More sharing options...
MikeBurgess Posted March 24, 2021 Share Posted March 24, 2021 Have you chronoed the new barrel? I ran 3 open guns over the chrono the other day with 1 batch of ammo all 125gr bullets, Rem SPP Gun 1, 1340fps 167.5pf, primers look fine Gun 2, 1400fps 175pf, primers pretty flat Gun 3, 1440fps 180pf, primers cratered like yours Guns 1 and 2 have similar chambers and throats gun 3 has a shorter throat all have similar barrel length. Link to comment Share on other sites More sharing options...
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