kasen Posted February 20, 2011 Share Posted February 20, 2011 (edited) I've just started reloading 9mm on my Dillon 550b press. I'm getting rounds through the press but I'm concerned with narrowing of the case that is being caused by stage 1 (which deprimes and reshapes). Here are the numbers for the reloads: .388 Case diameter at head .373 Case diameter at middle of case .378 Case diameter at neck As you can see the case is narrower in the middle. I've only seen factory ammo and it never looks like this. Any thoughts? Is this normal? I've backed out the stage 1 die further out than Dillon's instructions indicate it should be and it's still causing this unusual shaping... I'm using mixed brass and 124 grain Montana Gold CMJ. Edited February 20, 2011 by kasen Link to comment Share on other sites More sharing options...
al503 Posted February 20, 2011 Share Posted February 20, 2011 It is perfectly normal and some times referred to the 'coke bottle' shape. Set the size/decap die per dillon's instructions and keep loading. If you back it off, you'll get other problems. Link to comment Share on other sites More sharing options...
Jon Merricks Posted February 20, 2011 Share Posted February 20, 2011 Not sure about the numbers but the coke bottle look is good and actually what I look for in 9. Link to comment Share on other sites More sharing options...
bassochist Posted February 20, 2011 Share Posted February 20, 2011 that's perfectly normal on a dillon press with dillon dies, the 9mm is also a tapered case so it should be wider at the base. Link to comment Share on other sites More sharing options...
JasonS Posted February 20, 2011 Share Posted February 20, 2011 +1 for this: It is perfectly normal and some times referred to the 'coke bottle' shape. I actually did this exact same post about 6 months ago. Anyway make sure your sizing die is just short of hitting the shell plate when it's fully up, and be sure to double check the loads in a case gauge, and even better funciton check them in your gun, before you load a bunch. J Link to comment Share on other sites More sharing options...
GrumpyOne Posted February 20, 2011 Share Posted February 20, 2011 C'mon! Do a little leg work! http://www.brianenos.com/forums/index.php?showtopic=120265&st=0&p=1360324&hl=coke%20bottle&fromsearch=1entry1360324 http://www.brianenos.com/forums/index.php?showtopic=120225&st=0&p=1359969&hl=coke%20bottle&fromsearch=1entry1359969 http://www.brianenos.com/forums/index.php?showtopic=119141&st=0&p=1350824&hl=coke%20bottle&fromsearch=1entry1350824 http://www.brianenos.com/forums/index.php?showtopic=118708&st=0&p=1345274&hl=coke%20bottle&fromsearch=1entry1345274 http://www.brianenos.com/forums/index.php?showtopic=118583&view=findpost&p=1342366 http://www.brianenos.com/forums/index.php?showtopic=117188&view=findpost&p=1328268 http://www.brianenos.com/forums/index.php?showtopic=111943&view=findpost&p=1270889&hl=coke+bottle&fromsearch=1 http://www.brianenos.com/forums/index.php?showtopic=100625&view=findpost&p=1149045 There are many more...Search is your friend! If you want the answer to your question now, instead of waiting for someone to answer a new thread on an existing subject, use the search... Link to comment Share on other sites More sharing options...
kasen Posted February 20, 2011 Author Share Posted February 20, 2011 C'mon! Do a little leg work! http://www.brianenos.com/forums/index.php?showtopic=120265&st=0&p=1360324&hl=coke%20bottle&fromsearch=1entry1360324 http://www.brianenos.com/forums/index.php?showtopic=120225&st=0&p=1359969&hl=coke%20bottle&fromsearch=1entry1359969 http://www.brianenos.com/forums/index.php?showtopic=119141&st=0&p=1350824&hl=coke%20bottle&fromsearch=1entry1350824 http://www.brianenos.com/forums/index.php?showtopic=118708&st=0&p=1345274&hl=coke%20bottle&fromsearch=1entry1345274 http://www.brianenos.com/forums/index.php?showtopic=118583&view=findpost&p=1342366 http://www.brianenos.com/forums/index.php?showtopic=117188&view=findpost&p=1328268 http://www.brianenos.com/forums/index.php?showtopic=111943&view=findpost&p=1270889&hl=coke+bottle&fromsearch=1 http://www.brianenos.com/forums/index.php?showtopic=100625&view=findpost&p=1149045 There are many more...Search is your friend! If you want the answer to your question now, instead of waiting for someone to answer a new thread on an existing subject, use the search... Thanks GrumpyOne! Searching for Coke Bottle pulls up a lot of threads. Now that I know what a "Coke Bottle" shape is that is. Link to comment Share on other sites More sharing options...
GrumpyOne Posted February 20, 2011 Share Posted February 20, 2011 C'mon! Do a little leg work! http://www.brianenos.com/forums/index.php?showtopic=120265&st=0&p=1360324&hl=coke%20bottle&fromsearch=1entry1360324 http://www.brianenos.com/forums/index.php?showtopic=120225&st=0&p=1359969&hl=coke%20bottle&fromsearch=1entry1359969 http://www.brianenos.com/forums/index.php?showtopic=119141&st=0&p=1350824&hl=coke%20bottle&fromsearch=1entry1350824 http://www.brianenos.com/forums/index.php?showtopic=118708&st=0&p=1345274&hl=coke%20bottle&fromsearch=1entry1345274 http://www.brianenos.com/forums/index.php?showtopic=118583&view=findpost&p=1342366 http://www.brianenos.com/forums/index.php?showtopic=117188&view=findpost&p=1328268 http://www.brianenos.com/forums/index.php?showtopic=111943&view=findpost&p=1270889&hl=coke+bottle&fromsearch=1 http://www.brianenos.com/forums/index.php?showtopic=100625&view=findpost&p=1149045 There are many more...Search is your friend! If you want the answer to your question now, instead of waiting for someone to answer a new thread on an existing subject, use the search... Thanks GrumpyOne! Searching for Coke Bottle pulls up a lot of threads. Now that I know what a "Coke Bottle" shape is that is. Typing just the words "case narrows" in the search engine pulled up this result... http://www.brianenos.com/forums/index.php?showtopic=77432&view=findpost&p=896089&hl=case+narrows&fromsearch=1 Link to comment Share on other sites More sharing options...
NuJudge Posted February 20, 2011 Share Posted February 20, 2011 That shape means you have lots of neck tension on your bullet. This makes your bullet being telescoped back into the case during feeding much less likely. The bullet being pushed back into the case raises pressures a lot. Link to comment Share on other sites More sharing options...
Sarge Posted February 20, 2011 Share Posted February 20, 2011 NORMAL! Link to comment Share on other sites More sharing options...
bisonresq Posted February 21, 2011 Share Posted February 21, 2011 If you're new to reloading 9mm (or any other caliber) just make sure to case gauge! My achilles heel when I first started. Link to comment Share on other sites More sharing options...
GrumpyOne Posted February 21, 2011 Share Posted February 21, 2011 If you're new to reloading 9mm (or any other caliber) just make sure to case gauge! My achilles heel when I first started. Case gauging ammo is not the be all, end all of a good reload. Many rounds will not case gauge but will work perfectly in your gun. I suggest that you use your barrel as that's what they will be fired in. Many people have had issues that they fought tooth and nail to get to case gauge only to find out that it really didn't matter in their gun. Link to comment Share on other sites More sharing options...
bisonresq Posted February 21, 2011 Share Posted February 21, 2011 Agree with above. However, a case gauge can tell a beginner if they are WAY off. Just suggesting another tool to put in their toolbox. Link to comment Share on other sites More sharing options...
Bob DuBois Posted February 21, 2011 Share Posted February 21, 2011 Run the sizing die back down so you size as close to the extractor groove as possible. I like to use a small strip of paper as a go no go gauge. It should pull out with a slight drag but not go in. The sizing die holds the bullet so a coke bottle look is good. Link to comment Share on other sites More sharing options...
Red Ryder Posted February 22, 2011 Share Posted February 22, 2011 I like my women and Bullets that way! Curvey! Link to comment Share on other sites More sharing options...
ima45dv8 Posted February 22, 2011 Share Posted February 22, 2011 I like my women and Bullets that way! Curvey! Link to comment Share on other sites More sharing options...
Erik S. Posted February 22, 2011 Share Posted February 22, 2011 Follow Dillon's sizing instructions....definitely don't want to back your die out or you'll get chambering problems and a slew of other issues. I use Lee in my Dillon and screw 'em in till they touch the shellplate when the lever is actuated. Link to comment Share on other sites More sharing options...
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