What am I doing wrong with sizing brass?

jgs8163

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Sep 27, 2011
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Hi guys,

I need some help. I’ve been reloading for about 8 years now. I’ve run into something that’s got me totally frustrated. It’s happened a couple of times and I’ll be damned if I can figure out what it is.So I just prepped some once fired Norma 7 mag brass. Resized. Trimmed to length and chamfered with VLD trimming bit. Checked length and everything is perfect. Put in my 7 mag Hornady case gauge and fits perfect. I then charged the case and seated a 180 Berger VLD. The problem I have is after seating the bullet the round is not fitting into the case gauge. See pics below. The first 2 pics show the brass only in the case gauge and the last 2 are the completed round. I’ve had a similar situation recently with a 6.5 Creedmoor. It makes me think I’m not resizing the brass properly. I only full length resize all of my brass. I’m using Redding Master Hunter series dies. I also have a set of Lee and I got the same results. Any suggestions would be greatly appreciated.

5766FD45-4EB5-4E1E-883B-251807DC6584.jpeg
5A21B93E-C109-4EF7-9408-33E68946EC88.jpeg
4731642C-CBBF-4C1B-9946-FAB8F0EB610F.jpeg
0462ED0F-E136-4C7A-81C7-95BE59C3182F.jpeg
 

Bob Wright

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Litchfield Park, Az.
Will it chamber?
I use a headspace comparator to measure spent brass vs sized brass, mic necks before and after loading during initial set up.
The problem with this case guage is you're not getting individual measurements of the critical dimensions as it is either "go or no go.
Not much to go on unless you start measuring fired, to resized brass. Some dimension is being altered after bullet installation.
 

jgs8163

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Sep 27, 2011
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Southern Arizona
Will it chamber?
I use a headspace comparator to measure spent brass vs sized brass, mic necks before and after loading during initial set up.
The problem with this case guage is you're not getting individual measurements of the critical dimensions as it is either "go or no go.
Not much to go on unless you start measuring fired, to resized brass. Some dimension is being altered after bullet installation.
It does chamber. I don’t have that tool you mention but I imagine I will soon. Any good reads or a link you can share are appreciated.
 

Bob Wright

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Litchfield Park, Az.
It does chamber. I don’t have that tool you mention but I imagine I will soon. Any good reads or a link you can share are appreciated.
Start here:


There may be some Hornady videos on this official site.
Maintaining brass to chamber fits is really important. This measures your brass shoulder datum to the head and allows you to set your shoulder bump at FL sizing to fit properly (headspace) and prevent excess headspace.
You'll need dial or digital calipers to measure with this guage.
This guage is just one of those needed when setting up brass to fit each chamber one may have.
 

Stammster

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May 22, 2020
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122
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Houston, Texas
Belted cases are known not to completely resize all the way down to the belt. Do a search on resizing belted magnum cases and read what Larry Willis has to say. What you are experiencing is not uncommon.
So why did it fit fine in the case gauge after he resized, but not after he seated the bullet? I don’t think this is a resizing issue.

BTW, I use a Hornady case gauge on every round I load. Once it is resized, and once I seat the bullet.

OP...Are you running a compressed load? When the loaded round is inserted, does it look like the head is offset in the gauge slightly?
 
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