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Normal Topic 25-20 SS Help (Read 253 times)
Catahoula
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25-20 SS Help
Apr 21st, 2026 at 10:19pm
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just got the first few pieces of brass for my new rifle.  New CH dies, virgin Jamison brass, RCBS case lube and graphite inside the neck.  I cleaned the does when I got them, carefully luned and went slowly during the sizing process.  Every piece (3 total) cracked.   Two without the expander ball and one with.  What am I doing wrong?  I don’t want to damage more of this hard to source brass!
  
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Dellet
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Re: 25-20 SS Help
Reply #1 - yesterday at 12:35am
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Post a photo of a case as you recieved it.

That looks like the brass was un formed, a straight case. If that is true, they are not annealed. You could by the brass both ways from Jamison
  
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frnkeore
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Re: 25-20 SS Help
Reply #2 - yesterday at 2:50am
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DON'T use RCBS lube. Use Either Imperial or Hornaday.
  
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bnice
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Re: 25-20 SS Help
Reply #3 - yesterday at 7:41am
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I agree with Frank, but I use both when forming. Spray Hornady then Imperial on top. That said annealing is always a plus and on new finicky sizing I always do it. Your pictures looks like lube  issues, RCBS and Lee lube. They are thick and can create pressure pockets while sizing.
  
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oneatatime
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Re: 25-20 SS Help
Reply #4 - yesterday at 11:18am
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Forming with a sizer is a series of (starting with just a film of lube and don't add more! I use Imperial) a little pressure, pull out and smear carefully, a little pressure, pull out, smear, repeat, repeat, repeat until complete.
  
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Dellet
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Re: 25-20 SS Help
Reply #5 - yesterday at 1:12pm
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Lube generally causes dents. 
Cracks are generally from brittle brass
  
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Catahoula
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Re: 25-20 SS Help
Reply #6 - yesterday at 1:35pm
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Dellet wrote yesterday at 12:35am:
Post a photo of a case as you recieved it.

That looks like the brass was un formed, a straight case. If that is true, they are not annealed. You could by the brass both ways from Jamison


I think you are spot on.  The brass is not formed.  I will anneal and check results.  I’ll also take the lube advise from others into consideration.  Thanks for the help.
  
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Dellet
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Re: 25-20 SS Help
Reply #7 - yesterday at 2:01pm
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Yes. That’s the “basic” brass. Needs to be annealed then you can form as normal. Wouldn’t hurt to take it in steps.
  
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Catahoula
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Re: 25-20 SS Help
Reply #8 - yesterday at 7:55pm
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As I’m sure you experts are aware, these are too long after forming.  Any tips on trimming to help me avoid further damage when I try to trim these to length?  This brass is thin!!!
  
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