twister Posted February 20, 2013 Share Posted February 20, 2013 I'm loading 9mm with lead bullets, and getting rounds shaped like an 8. Large at the top, narrow middle, large at the bottom. Is there something I'm doing wrong? Any help on this is greatly appreciated, Dave. Link to comment Share on other sites More sharing options...
CZinSC Posted February 20, 2013 Share Posted February 20, 2013 It's normal. Do a search on Coke Bottle effect. Link to comment Share on other sites More sharing options...
Steve RA Posted February 20, 2013 Share Posted February 20, 2013 Usually called "wasp waist" but that is what you want - as mentioned above. Link to comment Share on other sites More sharing options...
NuJudge Posted February 21, 2013 Share Posted February 21, 2013 Some people believe that when the 'Wasp Waist' aspect is strong, and the bullet is soft, the case may size the bullet down to a smaller diameter on seating. This has not been my experience, but the bullets I cast are so hard they ring when dropped on concrete. If your bullet is too small, you will get lots of Leading. Link to comment Share on other sites More sharing options...
jeremy kemlo Posted February 21, 2013 Share Posted February 21, 2013 Mine do the same thing. I called Dillon and they said it was nothing to worry about. Link to comment Share on other sites More sharing options...
twister Posted February 21, 2013 Author Share Posted February 21, 2013 Thanks for the help. I tried searching coke bottle effect, and got 0 finds. Link to comment Share on other sites More sharing options...
latech15 Posted February 21, 2013 Share Posted February 21, 2013 Are you using a U-Die? Most all of mine look like that. Not because the bullet is changing, but because I use a U-Die with pretty much all of my calibers and the brass is sized smaller than factory and smaller than the bullet. U-Dies, hornady seating dies, and Lee Factory crimp dies are my standards. Link to comment Share on other sites More sharing options...
gng4life Posted February 21, 2013 Share Posted February 21, 2013 Thanks for the help. I tried searching coke bottle effect, and got 0 finds. Your search may have been too specific, try just "+coke +bottle" without the quotes. Here are some of the 142 results that came up: http://www.brianenos.com/forums/index.php?showtopic=168636&hl=++coke%20++bottle#entry1871149 http://www.brianenos.com/forums/index.php?showtopic=161434&hl=++coke%20++bottle#entry1809285 http://www.brianenos.com/forums/index.php?showtopic=161548&hl=++coke%20++bottle#entry1805199 http://www.brianenos.com/forums/index.php?showtopic=161340&st=25&hl=++coke%20++bottle#entry1802299 Link to comment Share on other sites More sharing options...
GuildSF4 Posted February 21, 2013 Share Posted February 21, 2013 Wasp waist is your friend, it prevents bullet setback. (The higher the friction between the case and the bullet the less likely you are to have setback. Crimping on an auto loader round should just remove the belling you did to start the bullet seating. A large amount of crimp will not prevent bullet setback in a loose case. (All of these I learned from Guy Neill and a couple of other folks that I no longer remember the names of.)) Link to comment Share on other sites More sharing options...
Sarge Posted February 22, 2013 Share Posted February 22, 2013 (edited) Wasp waist? That is a new one on me as well. Always called it coke bottle effect. Now, 8 shaped is definitely new! Either way you go it's normal and preferred in 9mm. Edited February 22, 2013 by Sarge Link to comment Share on other sites More sharing options...
Steve RA Posted February 22, 2013 Share Posted February 22, 2013 If you look at a loaded round and a coke bottle (old heavy glass one) side by side, they really don't have the same shape. Link to comment Share on other sites More sharing options...
Waterfowl-widowmaker Posted February 27, 2013 Share Posted February 27, 2013 I noticed it more in 40 than 9mm when I switched to a u die. Link to comment Share on other sites More sharing options...
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