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Babydriver
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Fire forming new brass
Today at 8:37am
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‘Ve been told, anneal the brass, fill with powder and som cream of wheat. How much of each
  
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silver
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Re: Fire forming new brass
Reply #1 - Today at 8:49am
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I use 7-10 grains pistol powder fill with corn meal and seat a wad on top of that . Fire in back yard.
  
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westerner
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Re: Fire forming new brass
Reply #2 - Today at 9:12am
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120 gr bullet and 57 gr 4064 fire formed these very nicely.
  
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calledflyer
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Re: Fire forming new brass
Reply #3 - Today at 10:06am
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as above, a 'normal' load, or factory ammo, works in my .280 imp. sometimes the accuracy is just as good as the formed cases. they do last much longer if neck sized alone afterward.
years ago I did that cream of wheat deal shooting upwards and was disgusted by the rain of crap returning to earth and the nasty odor.
  
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marlinguy
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Re: Fire forming new brass
Reply #4 - Today at 10:12am
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Fire forming with reduced loads is only done when the brass needs a fair amount of forming. If it's close to the final dimensions just load it with your correct charge and a bullet and it's good. 
I open up the necks of my 9.3x74R brass to .410" with my M die expander, then charge the case and seat the bullets. Fire them like usual, and they're great. They have a wasp like waist after expanding, but shoot very accurately when fire forming them.
I do the same with .303 British brass I chop off and expand for .40-50SS. They shoot great with my loads and finish forming.
  
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sharps4590
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Re: Fire forming new brass
Reply #5 - Today at 1:27pm
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marlinguy wrote Today at 10:12am:
Fire forming with reduced loads is only done when the brass needs a fair amount of forming. If it's close to the final dimensions just load it with your correct charge and a bullet and it's good. 
I open up the necks of my 9.3x74R brass to .410" with my M die expander, then charge the case and seat the bullets. Fire them like usual, and they're great. They have a wasp like waist after expanding, but shoot very accurately when fire forming them.
I do the same with .303 British brass I chop off and expand for .40-50SS. They shoot great with my loads and finish forming.


There's a tidbit of info that might come in handy.  40-50SS can be made from 303 Brit or 30-40 Krag..great!  In two weeks there's an auction with an original rolling block that is described as excellent in 40-50SS and I hadn't done any research.  So, thanks for answering the question before I asked it or spent time digging it out!!
  
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