Fugly Dillon bump

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WithoutWarning

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This has been bug'n me for a while so I'm ask'n for some
other opinions as to 'why'

I'm loading a bunch of 9mm and using Dillon dies. Goes very
smooth so far, thats not the problem. What I don't like, is after
the bullet has been seated, there is a 'bulge' in the case where the
bullet base sits. I don't like it, it's, well ugly and looks cheap to me.
Some brass is worse than others and when I load 45 auto, there
is no sign of a bulge, however, I'm using RCBS dies for 45.

Does anyone else get this unsightly bump in there brass when
using Dillon dies for 9mm ? I tried backing the die off a bit but
that didn't help and really isn't a good idea.
I started to load a few 147gr'ers tonite, and after the first one
seated. . . . holly crap! I made a reverse bottle neck cartridge!

How about other die makers, do they produce 'da bump' ?
Thx. all.
 
I get the same bump..I dont know which press you have. I have a Square deal B...I have seen the same bump on other 9mm rounds loaded on a square deal...maybe something to do with the dies....My rounds function fine..I find that crimping a bit more seems to help..
 
Oh yeah, my rounds function fine too. No worries there.
You're using Dillon dies aswell wayne I take it ?
I have them mounted on a 550B
I'm almost tempted to buy a 'something else' sizer die,
just to see.
 
There is a reason for the bump. Remington used to be notorious for making brass with paper thin walls. Case tension when reloading suffered. Dillon began to profile there dies to avoid the problem. The reduced area behind the mouth of the case provides a stop for the bullet. That and a proper crimp help to reduce the number of problems caused by bullets being driven in to the case while feeding.

The .45 acp loaded using Dillon dies and 200gr lswc look like old fashioned Coke bottles.
 
Canuck223 said:
There is a reason for the bump. Remington used to be notorious for making brass with paper thin walls. Case tension when reloading suffered. Dillon began to profile there dies to avoid the problem. The reduced area behind the mouth of the case provides a stop for the bullet. That and a proper crimp help to reduce the number of problems caused by bullets being driven in to the case while feeding.

The .45 acp loaded using Dillon dies and 200gr lswc look like old fashioned Coke bottles.
Click to expand...

Ok, that makes sense. I didn't think about it like that.
However, factory loads show no signs of such and I don't think
I have a prob with bullets being driven further into the cases
during the feed cycle with those . . , know what I'm say'n ?
The brass that shows it the most is Winchester FWIW
but I do have a healthy crimp on these rounds aswell.

Thx. for the responces guys, I still want to learn more.
 
Are we talking about an hour glass shape or a fat chick kinda shape? I was told a slight hour glass shape on reloaded rounds (and women for that matter!) was a good thing.
:confused:
 
beltfed said:
You should worry less about how your ammo looks and spend that time to get out shooting. Speaking of which, when are we going gopher blasting?:rolleyes:
Click to expand...

Mike;
Rounds that LOOK GOOD automatically hit the 10 ring
by themselves. So I always try to shoot 'pretty' rounds.
Thats why you have to practice alot more than I do !
 
There is another possibility.....measuring the bullets, which I always do with new batches....most are bigger the .355" some can be had up to .356" of course the bigger will make a bigger 'Bulge'......

You mention a healthy crimp.....you need very little crimp....just enough for the bullets to stay put......when you disassemble your round (do one) you should not have any mark on the bullet.
 
Dansy said:
There is another possibility.....measuring the bullets, which I always do with new batches....most are bigger the .355" some can be had up to .356" of course the bigger will make a bigger 'Bulge'......
Click to expand...

Yah, .0005 on each side of the case is oh so noticable........:p
 
joe-nwt said:
Yah, .0005 on each side of the case is oh so noticable........:p
Click to expand...

.001" yes it's noticable I did say .356" I shoot only Montana Gold bullets, but with plated the size vary somewhat....personally I don't care how they look, just how they shoot.....I shoot more then the average shooter the bulge is always there no matter what calibers.....;) :50cal:
 
Dansy said:
.001" yes it's noticable I did say .356" I shoot only Montana Gold bullets, but with plated the size vary somewhat....personally I don't care how they look, just how they shoot.....I shoot more then the average shooter the bulge is always there no matter what calibers.....;) :50cal:
Click to expand...

Pssst! A .001 size increase on a round object equates to .0005 increase on both sides.......;)
 
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