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Resizing brass problem

I am resizing 7mm/300wby brass and when I resize it it dents around shoulder. It seems to do it more on fired brass vers new brass. Here are a couple pics of it. Ive cleaned the die and it doesnt matter it still does it. Im using RCBS dies.
 

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Hydrolic dent;
too much lube, just lube the body lightly and brush a little inside the neck for the button.
 
necchi said:
Hydrolic dent;
too much lube, just lube the body lightly and brush a little inside the neck for the button.

Just wondering why it only did it with the fired brass and not new brass? Is due to the brass being softer after it's been fired?
 
Fired brass is just that, "Fireformed" . The brass is stretched, when FL sizing tolerances are tight. Any excessive lube will caused this.

I had the same think happen to me. I use very little lube, no problems now.
 
lub will collect inside the die when this has happend for a while, take a q tip, and remove the deprimer rod then clean the inside of the die.

Bob
 
Use Imperial sizing wax. Way better than a lube pad. Use your fingers to apply. Use sparingly. I can get about 5000 cases reloaded on one little tin of it. Easy on easy off, no dents, and no smell. Use a clean old washcloth to remove it after sizing.
 
One more thing to check. Most FL sizing dies have a vent hole in the side of the die near the top of the threads. Make sure this hole is open using a small paper clip end or large safety pin. Air can get trapped otherwise and dent your shoulders.
 
+1 on Imperial . It's much easier to control how much you apply and for the neck I took some shot and graphite and placed them in a small covered tin that I can shake to mix up and dip the case neck in that . No indents and no powder sticking to the inside of the neck .
 
If you use the grease pad,use it very very very very very sparingly. Like they said above,use the wax and use that so there is only a slight film on the case.
 
You could also consider changing to a Forster Benchrest FL sizing die. They have a relief hole that prevents this from either trapped air (yes, air can do this too) or excess lube.

For that matter even Lee Sizing dies have this same hole.

The relief hole also makes it easier to remove the case from the die as it prevents any vacuum from forming between case and die while the neck is still in contact with the die.
 
The reloading manuals tell you to wipe excess lube from the shoulder and neck areas.

When full length resizing, the brass and lube have only one direction to move and are being forced upward into the shoulder and neck area. Cut back on the amount of lube and it won't migrate to the shoulder area and cause dents.

Your new cases did not dent because the cases were smaller and no lube was forced or squeezed upward onto the shoulder area.
 
SBS said:
One more thing to check. Most FL sizing dies have a vent hole in the side of the die near the top of the threads. Make sure this hole is open using a small paper clip end or large safety pin.

Good tip, sometimes we forget that.
The instructions that come with the dies recommends checking the hole,,,
 
necchi said:
SBS said:
One more thing to check. Most FL sizing dies have a vent hole in the side of the die near the top of the threads. Make sure this hole is open using a small paper clip end or large safety pin.

Good tip, sometimes we forget that.
The instructions that come with the dies recommends checking the hole,,,


Instructions ?... 8)
 
COULD ALSO BE that the shoulder dia. in the chamber is larger than in the die and shoulder of the case is buckeling. When is the shoulder buckeling? Is the shoulder buckeling with a partial neck size?
 
I was using Dillion spray lube and was having the same problem. I haven't really tried to many others.

I did switch to Hornady's case lube, it's like a wax. I put a little in the palm of my hand and roll the brass in it. I wipe off any excess, sometimes with a clean rag. It's so thin, you barely see it on the brass.

I am using the same dies and I haven't had this problem since switching to the Hornady lube.

JMO
 
I have always made it a habit to clean the inside of the sizer die after each use. I wet a cotton q-tip with Hoppes, wet down the interior & dry out, with a rag.

Imperial die wax (all I use) never has a chance to buildup & by keeping it always clean & dry there is less chance of moisture being trapped inside the die body, leading to rust. My dies that are over 40 years old, are still completely rust free.
 

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