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Old 03-18-2012, 02:20 AM   #11
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Quote:
Originally Posted by TLuker View Post
He figured it out. It's his neck sizing die. The mandrel is way off center and the bullet is ending up off center after seating. We ran his brass through my sizing die and no problem. Run it through his and the bullets will not chamber (using same seating die). And his bullets were not marked by the lands. There was only one mark on one side of his bullets and it was from the throat. I'm also thinking RCBS just totally messed up on the mandrel for his die? The adjustment screw for the mandrel sticks up a good 3" above the die with the decapping pin sticking a 1/4" out of the bottom of the die. I've never seen an adjustment screw that long in a die.
contact rcbs. they will make it right


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Old 03-18-2012, 04:38 AM   #12
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i second JonM's suggestion. they fixed a die for me that was bought over 40 years ago! only paid for the shipping. they will stand behind their products.
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Old 03-18-2012, 04:38 PM   #13
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I had this problem before on 30-06 and 300WM. The 06 brass just needed trimming and the 300 ended up being your exact problem only with Hornady dies. During this whole investigation and head scratching experience, I learned about chamber concentricity (word?) and walked away from the neck sizing dies altogether. I adjusted my FL dies to neck size and barely bump the shoulder back. All chambering issues disappeared and accuracy was surprisingly improved.
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