Garmil Posted December 28, 2015 Share Posted December 28, 2015 Just worked up my major load for my new open gun. 9.4 gr aa#7 1.245 oal 124 pd jhp 170pf Load feels great and the primers are still nice and round zero pressure signs. I am getting a considerable bulge above the case rim though. I'm using a lee undersized sizing die and the rounds fit easily in the chamber maybe a little loose. Would a standard sizing die possibly decrease the bulge with a tighter fit in the chamber? Link to comment Share on other sites More sharing options...
GrumpyOne Posted December 28, 2015 Share Posted December 28, 2015 Maybe, but the culprit is the chamber of your gun. What gun are you shooting these through? Link to comment Share on other sites More sharing options...
Garmil Posted December 28, 2015 Author Share Posted December 28, 2015 Tanfoglio Link to comment Share on other sites More sharing options...
GrumpyOne Posted December 28, 2015 Share Posted December 28, 2015 If they feed and fire fine, then where in lies the problem? Link to comment Share on other sites More sharing options...
Bamboo Posted December 28, 2015 Share Posted December 28, 2015 Hey! I think I know the upper you are shooting and noticed the same thing. I met guy who was using a Tanfo Limited Elite 38 super in limited minor and his gun did the same thing so I think it is how Tanfo reams their chambers (or at least on these two guns). I'll say that was a reliable upper and never had any jams with it..it would run anything that made it into the chamber. I used a Dillon sizer and didn't worry about the U-die as with a U-die you can get hard rings if the brass is bulged. The Dillon has a nice lead in and worked well for me for that gun. How did it work for you with the AA#7 load? Link to comment Share on other sites More sharing options...
Garmil Posted December 28, 2015 Author Share Posted December 28, 2015 If they feed and fire fine, then where in lies the problem? Feeding and firing fine isn't the problem. Just worried that the bulge gets resized over and over and will get weak. I guess I'll just see how it goes. I did resize a fired case and it didn't look too bad no real creases or lines left. Load feels great so far only shot a few over the chrono so time will tell but I think it's going to work. Felt flat not too much recoil in to the hand, very loud though. Link to comment Share on other sites More sharing options...
gunnit Posted December 28, 2015 Share Posted December 28, 2015 Tanfoglio I'm running a V12 in 38 and I'll get a little bit of a bulge also. I'm able to get at least 13+ reloads out of a batch of cases before I start to to see a crack on a few. If possible try and keep track of some cases, and see how many reloads you can get out of them before you find any problems. That's about all we can do. Link to comment Share on other sites More sharing options...
Garmil Posted December 28, 2015 Author Share Posted December 28, 2015 13 wouldn't be bad I'll try to keep track. Link to comment Share on other sites More sharing options...
BSeevers Posted December 28, 2015 Share Posted December 28, 2015 Really doesn't get weak unless you are ridiculous. Gotta let brass go on a regular basis. What it might do is fail to chamber. I grind the steel around the carbide ring on my die. So you get the deepest seating with just carbide exposed. Every mm counts. Link to comment Share on other sites More sharing options...
gunnit Posted December 28, 2015 Share Posted December 28, 2015 Really doesn't get weak unless you are ridiculous. Gotta let brass go on a regular basis. What it might do is fail to chamber. I grind the steel around the carbide ring on my die. So you get the deepest seating with just carbide exposed. Every mm counts. Bill which dies are you using ? And are you just grinding them square across the bottom ? Link to comment Share on other sites More sharing options...
noylj Posted December 28, 2015 Share Posted December 28, 2015 (edited) Dies that size the lowest are Lee and Hornady. To me, a U die is something you get only if you need to get one. I couldn't get major until about 10.0 gn of AA7. N105 and 3N37 have been better for major, but you're getting great results with only 9.4gn AA7. Maybe, if worried, you should go to .38 SC cases and you might be able to use a Lee Bulge Buster kit. I find that the SC case work great in all my .38 Supers, with no adjustment to the extractor. Edited December 28, 2015 by noylj Link to comment Share on other sites More sharing options...
Garmil Posted December 28, 2015 Author Share Posted December 28, 2015 I'm using new starline 38sc brass. I have no holes and about a 5" barrel i think is why my velocity is good. Link to comment Share on other sites More sharing options...
BSeevers Posted December 28, 2015 Share Posted December 28, 2015 Really doesn't get weak unless you are ridiculous. Gotta let brass go on a regular basis. What it might do is fail to chamber. I grind the steel around the carbide ring on my die. So you get the deepest seating with just carbide exposed. Every mm counts. Bill which dies are you using ? And are you just grinding them square across the bottom ? Dillon I think. Probably at least 20 yrs old. Yes expose the carbide ring even a little higher than "even" so you can seat as low as possible Link to comment Share on other sites More sharing options...
gunnit Posted December 28, 2015 Share Posted December 28, 2015 I have the Dillon dies also, I might give this a look. Thank you Bill. Link to comment Share on other sites More sharing options...
Garmil Posted December 29, 2015 Author Share Posted December 29, 2015 Is this helpful with the Lee die also? Link to comment Share on other sites More sharing options...
gunnit Posted December 29, 2015 Share Posted December 29, 2015 (edited) Is this helpful with the Lee die also? I think the Lee die is fine the way it is. On the Dillon, the outer ring extends down just a bit longer than the inside sizing ring. I run Starline 38 SC brass, and my Dillon dies have worked great for me, sizing everything fine with no issues. Possibly in the future I might take it down to the carbide sizing ring, as BSeevers did, and see if it makes any difference. For now I don't want to mess with anything that's been working well for me. Edited December 29, 2015 by gunnit Link to comment Share on other sites More sharing options...
BSeevers Posted December 29, 2015 Share Posted December 29, 2015 Is this helpful with the Lee die also? I think some of mine are Lee Just look at them If there is a "taper" of steel get rid of that and expose carbide Link to comment Share on other sites More sharing options...
Garmil Posted December 31, 2015 Author Share Posted December 31, 2015 There is a little bit of shoulder on my Lee die but not much. I ordered a Lee standard sizing die to see if it helps the bulge Link to comment Share on other sites More sharing options...
Mark C Posted January 2, 2016 Share Posted January 2, 2016 I use a Lee crimp and resize die on 9 ,40 ,45 and 38 super. Link to comment Share on other sites More sharing options...
jcc7x7 Posted January 2, 2016 Share Posted January 2, 2016 How many .000 (thousands) are we talking about with the bulge ? Link to comment Share on other sites More sharing options...
Sarge Posted January 2, 2016 Share Posted January 2, 2016 My carbide ring cracked when I had the bottom of my Dillon die milled down. I may have had it touching the plate a little hard but still.... I know and trust Bseevers word but it didn't work for me. I use LEE standard and Udie when loading certain brass Link to comment Share on other sites More sharing options...
Garmil Posted January 2, 2016 Author Share Posted January 2, 2016 Unsized starline case .379 Sized with Lee u die .374 Fired case at neck .383 Fired case at bulge .393 Link to comment Share on other sites More sharing options...
BSeevers Posted January 2, 2016 Share Posted January 2, 2016 SAAMI max is .384 Link to comment Share on other sites More sharing options...
Garmil Posted January 2, 2016 Author Share Posted January 2, 2016 SAAMI max is .384 Is that supposed to make me feel good or bad? Link to comment Share on other sites More sharing options...
jcc7x7 Posted January 2, 2016 Share Posted January 2, 2016 Might want to cast the chamber?! I've never had to do that so can't be much help but doesn't seem like it should be that much over spec. I've shot a lot of 38SC and never gotten any where close to those dimensions. The Tanfo guys might be able to give you more info on how the open gun chambers are I just got a limited (40S&W) and with the same loads I shoot in my Schumann bbl's in 2011.1911 guns I'm getting the same size fired brass with in a .001. of those so the 40 reamers Tanfo is using are in spec. I'd maybe go down on your loads and see if it's bulging with lower/low pressure loads Link to comment Share on other sites More sharing options...
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