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Posted: 4/23/2011 7:53:56 PM EDT
| Reloading Noob here...Just got my first reloading press,(650xl) and I set it up for initial trial for 9mm Luger. made some dummy rounds to check chamber fit. Noticed that the round had a slight hour-glass shape to it. measurements are web - .3885, middle - .3750, top (where bullet is seated) - .3760. Is this normal? I have not found any pics in any of my manuals that show this...ANY comments and advice is most welcome. |
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Lots of different brands of 9mm brass out there , some brands are a problem, I was never sure if it was dimensions or hardness of the brass.
Adjust your sizinng to just kiss the shellholder to size as much of the case as possible , set the bullet on the case square to reduce tilting (and buldgeing) and use your case gage or barrel to check finished loads Track the case brands (by headstamp) that are tight in the case gage and you might find one or two that aren't worth messing with. To answer your basic original question, yes depending on brass,dies,and bullet type and brand, some 9mm reloads will be a bit "lumpy" under close inspection . If they work ok in your gun everything is cool |
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some sizing dies are tighter than others, Dillon is known for having tight dies. what's going on is the case is being slightly oversized, but then the projectile buldges out the case and you get the "coke bottle" affect. Not much you can do about it other than switch dies |
| It's a tapered case. These are the SAAMI dimensions for the round. LINK. The bullet is going to bulge the top of the brass a little, and the deeper the bullet is seated the more noticeable it will be, since the brass gets thicker. Buy a case gauge, or use your chamber to check your rounds. |
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Quoted:
If your loading on a 650 you should get Lee factory crimp die and put it in the last station. It post sized the rounds and ensures cases will chamber +1 It is the last process I do! 1/32nd to 1/16th of inch tops on the case. Before this I was having some problems in my Walther and 1911 once they got a little dirty from shooting. |
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The "hour glass shape" is normal in 9mm and you'll also encounter it when loading .45ACP (and some other short brassed rounds).
The brass thickness and the depth of the bullet seating (not to mention the physical size of the bullet) has a lot to do with the amount of "shape" that you'll see/encounter. Don't worry. But, make sure that your rounds will fit......... 
A little adjustment may still be required to ensure feeding but, for the most part the barrel test is sound. Aloha, Mark |
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Quoted:Tyromeo55 - What would be the difference between the Lee crimp die and the Dillon? And could you elaborate a bit on what you were saying?
Thanks!!! The dillon crimp die is a taper crimp and the lee is their factory crimp (kinda a squeeze style taper) The advantage to the LEE is that it has a carbide sizer ring that will post size the round to ensure proper dimension. The dillon does not have this The main problem lies in all of the cases not being the exact same length so they get more or less, sizing in station 1, more or less taper to accept the projo and possibly too much taper adjusted in the die slightly bulging the round. Post sizing makes all those problems go away |
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