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Old 07-22-2013, 10:05 PM
MMA10mm MMA10mm is offline
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Join Date: Sep 2005
Posts: 28
Different bullets will react differently to this. I once sized down some .323" 8mm bullets to load in a .318"-barrelled Mauser. The core became loose from the jacket. Turns out the jacket will spring back a bit while the lead core stays smaller, creating looseness. The solution, IF this happens to you (doesn't always), is to size a couple thousandths smaller than your desired final diameter, and then run the bullet through a bump-die to re-expand the whole thing to final diameter. Then, the core and jacket stay firmly swaged together.
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