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I'm thinking about doing my first Ackley cartridge. Typically, how much does the overall case length shrink when fireforming? I plan on using Norma or RWS 7x57 brass as the parent case.

Mike
 

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Its been a few years since I did it.

I've been so busy at work the last few years, I really haven't had time to finish my load development. I do remember that I used Norma 7x57 brass with no problems. I think the shrinkage was 1 or 2 thousandths.
 
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