Flight Posted August 1, 2009 Share Posted August 1, 2009 New open gun built by a gunsmith AET barrel super 38 Load: 124 grains with 7.8 VV 3n37. Factor 165 My once fired case are all bulging at the bottom of the case. Checked the chamber and as we all know its got fluting and the bottom/outer part of the chamber is kinda beveled. The case itself is good except for the bottom or outer part of the chamber where the bevel is, that where the bulging in the case occurs. Is this normal with the aet in super 38 because in aet 40cal standard I dont see this kind of problem. Couldnt go lower in my load since my factor is 165 already. So what to do? Need you help here. I'll be getting my camera soon I'll post pics of the brass asap. Link to comment Share on other sites More sharing options...
wide45 Posted August 1, 2009 Share Posted August 1, 2009 You need to reduce the pressure in your load. Bulging the base is bad JuJu. Just say no. Link to comment Share on other sites More sharing options...
Jaxshooter Posted August 1, 2009 Share Posted August 1, 2009 I have a 38 super comp AET barrel, it does not bulge the brass with 10.2 gr of 3N38. Link to comment Share on other sites More sharing options...
werewolf45auto Posted August 2, 2009 Share Posted August 2, 2009 Not sure how bad your bulging is but I to started a thread because of my bulding and it seems to be pretty comen. After you size and load them will they fit in the chanmber gauge or your chamber ? If so I would keep shooting it. I'm on a few reloadings with no problems. Also I'm useing 8grs of VV N350 and have loaded some vv 3n37 at 7.0grs-8.2grs with the same bulging. Link to comment Share on other sites More sharing options...
GrumpyOne Posted August 2, 2009 Share Posted August 2, 2009 I don't know about AET barrels, but bulging is quite common in non supported barrels and a little is expected even in supported barrels. 38 super is a high pressure load, so some bulging (shouldn't be to extreme though!) is acceptable. After all, that's why we re-size brass (at least one reason why). What kind of brass are you using? Some brass has a weaker web than other types. Are you using 38 super +P brass? Your load is well within acceptable range as far as powder goes, but what is the OAL? The slightest difference in OAL in an already high pressure load can lead to drastic pressure changes, causing the bulge. Link to comment Share on other sites More sharing options...
Flight Posted August 2, 2009 Author Share Posted August 2, 2009 Werewolf- I think were on the same boat here. What I did on the range today was I brought 20 brass and started shooting and reloading the same brass while inspecting on pressure signs. It would bulge at the bottom like a wedding ring but once resized it came back to form. I ended my session with 12 reloads with the same brass. So far so good but I'm just not comfortable or maybe not used to this bulging on the brass but made 12 reloads til it was late in the afternoon. I'll probably load the same brass 3-4 more times and I'll retire them. Anybody experience this please chime in. Link to comment Share on other sites More sharing options...
Flight Posted August 2, 2009 Author Share Posted August 2, 2009 BTW I havent had any jams whatsoever. Link to comment Share on other sites More sharing options...
werewolf45auto Posted August 2, 2009 Share Posted August 2, 2009 (edited) Werewolf- I think were on the same boat here. What I did on the range today was I brought 20 brass and started shooting and reloading the same brass while inspecting on pressure signs. It would bulge at the bottom like a wedding ring but once resized it came back to form. I ended my session with 12 reloads with the same brass. So far so good but I'm just not comfortable or maybe not used to this bulging on the brass but made 12 reloads til it was late in the afternoon. I'll probably load the same brass 3-4 more times and I'll retire them. Anybody experience this please chime in. Sounds just like my story. I always knew it be bad and I have just got use to it now. I have only been shooting Open for a few months now and don't know nearly know what some of the others on hear do. My pf with N350 is 175 and other than looks this bulging has never cause me any trouble. I am shooting supercomp and sounds like your shooting super but if your on that many reloading I would say your buldge is nothing to worry about. On the topic I started, a fourm member posted a picture of a case he cut of his bulged cases that had been shot many times to show that the case thickness was still good as well. Search it out and read up on it. Happy shooting, David Edited August 2, 2009 by werewolf45auto Link to comment Share on other sites More sharing options...
shooterbenedetto Posted August 2, 2009 Share Posted August 2, 2009 That is very common..go to Henning' store and buy the undersize die. Link to comment Share on other sites More sharing options...
superdude Posted August 2, 2009 Share Posted August 2, 2009 pics might be helpful so we can see just how much bulge you're talking about. the question is how much of a bulge do you see. if the sizing die is removing all of the bulge then you might not have a problem. on the other hand, if the bulge is big enough that it is causing cracks in the metal, that's a potential problem. see http://www.38super.net/Pages/Brass.html near the bottom of the page for examples. werewolf45 - you might be referring to an excellent photograph by G-ManBart. a search should find it. also, that photo can be found at http://www.38super.net/Pages/Brass.html, near the bottom of the page, figure 2. Link to comment Share on other sites More sharing options...
G-ManBart Posted August 2, 2009 Share Posted August 2, 2009 (edited) All of the Super/Supercomps I've seen will bulge the case a little bit. It usually just looks like one side has a bit of a guppy belly to it. There shouldn't be any sharp edges to the bulge...it's just a gradual taper on one side of the case. If they resize properly and fit the chamber, you're probably fine. Here's a link to a site where the pics of the sectioned cases are posted...good reading: http://www.38super.net/Pages/Brass.html Edit to add: Superdude typed faster! LOL..... Edited August 2, 2009 by G-ManBart Link to comment Share on other sites More sharing options...
Pat Miles Posted August 2, 2009 Share Posted August 2, 2009 All of the Super/Supercomps I've seen will bulge the case a little bit. It usually just looks like one side has a bit of a guppy belly to it. There shouldn't be any sharp edges to the bulge...it's just a gradual taper on one side of the case. If they resize properly and fit the chamber, you're probably fine. Here's a link to a site where the pics of the sectioned cases are posted...good reading:http://www.38super.net/Pages/Brass.html Edit to add: Superdude typed faster! LOL..... Bart, This is the exact problem that Jerry B was having with his new Open gun. Hellacious problems with jamming. Looking at the chamber of his barrel it was easy to see that the bottom was cut different. It was not touched by the smith who put it together for him as it had the fluted chamber. He was told by the good folks who made the barrel that he was loading too hot even though he chronoed his loads at 172 PF. He had the gun rebarreled (KKM) and a new slide fitted about two months ago. No problems since. CYa, Pat PS Hope you are having a safe and comfortable journey. Link to comment Share on other sites More sharing options...
G-ManBart Posted August 2, 2009 Share Posted August 2, 2009 All of the Super/Supercomps I've seen will bulge the case a little bit. It usually just looks like one side has a bit of a guppy belly to it. There shouldn't be any sharp edges to the bulge...it's just a gradual taper on one side of the case. If they resize properly and fit the chamber, you're probably fine. Here's a link to a site where the pics of the sectioned cases are posted...good reading:http://www.38super.net/Pages/Brass.html Edit to add: Superdude typed faster! LOL..... Bart, This is the exact problem that Jerry B was having with his new Open gun. Hellacious problems with jamming. Looking at the chamber of his barrel it was easy to see that the bottom was cut different. It was not touched by the smith who put it together for him as it had the fluted chamber. He was told by the good folks who made the barrel that he was loading too hot even though he chronoed his loads at 172 PF. He had the gun rebarreled (KKM) and a new slide fitted about two months ago. No problems since. CYa, Pat PS Hope you are having a safe and comfortable journey. Hey Pat, Yeah, I talked to Jerry about it. It seems that was a bit different than this poster since Jerry's wasn't running and the OP's is. I wish I'd known about it at the time, taken a look at the barrel and then called Mike up to see. All of my Super/sc barrels( Bar-Sto, KKM and Schuemann) put a bulge in the brass. They're all pretty similar actually and the brass seems to last a long time, but it's a fairly minor bulge. I'm curious to see some pics of the OP's brass. In fact, I remember NM3gnr bringing me some once-fired brass out of his new gun and asking me if the bulge was unusual. I grabbed some out of my guns and we compared...essentially identical. Drive is going well and we've only got 300mi to go tommorrow! R, Link to comment Share on other sites More sharing options...
Y. Koester Posted August 2, 2009 Share Posted August 2, 2009 My aet 40 cal brass is bulging just like what you all have described. I have had some types of brass blow the case heads off!! So now i just load the same brass 3-4 times and then i get rid of it. My load is lower than p pres's load but he is using a sti barrel. Link to comment Share on other sites More sharing options...
rgkeller Posted January 13, 2012 Share Posted January 13, 2012 I have a new 38 Super upper with an AET barrel and the bulging is significant. Knowledgable fellow at the range said AET 38 Super barrels were famous for this. He dumped his. Any advice? Chrono was 170. Link to comment Share on other sites More sharing options...
Kriojas Posted January 15, 2012 Share Posted January 15, 2012 I put a AET barrel in one of my Caspian guns after I noticed the cases were bulging I contacted scheumann they said the barrel is designed like that to let you know the pressure is to high...... I was using 10.7 grn of 3n38 which is not suppose to create that much pressure. Long story short if you shoot a AET barrel use that brass in that gun only cause it generally won't run in other barrels once it bulges. Stick to an svi barrel... Link to comment Share on other sites More sharing options...
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