Mbauer67 Posted November 6, 2011 Share Posted November 6, 2011 I am having a little trouble figuring how much to bell the mouth of a 9mm case to maintain proper Bullet alignment. A lot of people say just enough to let the bullet sit on the mouth of the case, but I am having a little trouble figuring out just how much that is. Is there a way to measure the amount of bell, or picture maybe. Any advice? Link to comment Share on other sites More sharing options...
bradthegunmaniac Posted November 6, 2011 Share Posted November 6, 2011 What kind of bullet are you loading? Link to comment Share on other sites More sharing options...
Recoil45 Posted November 6, 2011 Share Posted November 6, 2011 (edited) I learned how much was enough by not having enough. Start with almost none, then increase a tiny bit at a time until you have enough. It does not take much at all. Edited November 6, 2011 by Recoil45 Link to comment Share on other sites More sharing options...
Mbauer67 Posted November 6, 2011 Author Share Posted November 6, 2011 MG 124 CMJ's. Link to comment Share on other sites More sharing options...
mizer67 Posted November 6, 2011 Share Posted November 6, 2011 .378 is enough for me to get that bullet seated. It seems to have a very slight boat tail. You could go up to .380 if you're having trouble getting them to stay put. Link to comment Share on other sites More sharing options...
LPatterson Posted November 6, 2011 Share Posted November 6, 2011 .380 is the outside diameter of a loaded round in my Lyman manual so for a bell I would suggest something like .004 more than an empty sized case. Your CMJ can get by with less bell than a plated or moly bullet. That said my Dillon is set so I don't scrape the coating on a 130gr BBI. Link to comment Share on other sites More sharing options...
CocoBolo Posted November 6, 2011 Share Posted November 6, 2011 The correct answer is impossible since you did not tell us what kind of bullet you are loading, Moly, Cast, Jacketed etc. In general terms some where between .378 and .382. The higher number for Moly coated bullets. Note that mixed brass is mixed brass thickness varies and you have to compromise to get all of them to work properly. Link to comment Share on other sites More sharing options...
The_Vigilante Posted November 6, 2011 Share Posted November 6, 2011 (edited) Interesting. I just installed a Hornady Bullet 9mm seating die and they recommend belling the 9mm case to .385--the bullet does seat perfectly using this amount of belling Edited November 7, 2011 by The_Vigilante Link to comment Share on other sites More sharing options...
CocoBolo Posted November 7, 2011 Share Posted November 7, 2011 Interesting. I just installed a Hornady Bullet 9mm seating die and they recommend belling the 9mm case to .385--the bullet does seat perfecting using this amount of belling I have the early version of the bullet feeder and it says .382 in the manual, but I've run .384-.385 with good results. If it just came with a muffler it would be better. Link to comment Share on other sites More sharing options...
98sr20ve Posted November 7, 2011 Share Posted November 7, 2011 I am having a little trouble figuring how much to bell the mouth of a 9mm case to maintain proper Bullet alignment. A lot of people say just enough to let the bullet sit on the mouth of the case, but I am having a little trouble figuring out just how much that is. Is there a way to measure the amount of bell, or picture maybe. Any advice? .015" over the sized mouth size. Link to comment Share on other sites More sharing options...
Mbauer67 Posted November 7, 2011 Author Share Posted November 7, 2011 Perfect, thanks for the advice everyone, I feel a lot better now Link to comment Share on other sites More sharing options...
jcc7x7 Posted November 11, 2011 Share Posted November 11, 2011 I adjust based on the bullet, so if you chang eyou may have to reajust the bell Link to comment Share on other sites More sharing options...
wide45 Posted November 11, 2011 Share Posted November 11, 2011 I use the seating die as a no go gage. Link to comment Share on other sites More sharing options...
twodownzero Posted November 11, 2011 Share Posted November 11, 2011 Although you don't want to go too much, this isn't a critical part of reloading that requires measuring. If the bullet balances on the top of the case without holding it, there's enough bell. Within reason, there's a pretty broad range of acceptable amount of bell. Personally, I am happy with just enough bell to barely be able to see the fact that the case is belled, and in my experience, it has worked perfectly. Link to comment Share on other sites More sharing options...
Sin-ster Posted November 12, 2011 Share Posted November 12, 2011 I use the seating die as a no go gage. +1 Shave some brass... it's obviously too much. Link to comment Share on other sites More sharing options...
stick Posted June 10, 2013 Share Posted June 10, 2013 I adjust based on the bullet, so if you chang eyou may have to reajust the bell +1 Link to comment Share on other sites More sharing options...
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