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Posted: 7/31/2009 10:17:04 PM EDT
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I have the Lee 4 die set in .40/10mm. I am using the expander die on new stareline 10mm brass and find case shavings/dust on the case itself and inside the die after every pull. I have taken the die apart and ran my finger all over to feel for burrs and came up empty. Any ideas or options what's causing this or how to fix it? I was thinking about putting the die on a buffer wheel but dunno.
Mike |
| My Lee 4 die set for .40 did that too with the expander/bell die for about the first 50-100ish rounds. Now I don't get any shavings and it does it's job quite well. I think it was some roughness on the bell that polished out after getting ran through some brass. |
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Thanks for the quick answers fellas. Wouldn't I feel the burrs on the new brass case with my fingers? Not questioning your answer, just trying to learn. A case mouth de-burring tool will eliminate the burrs. This is the solution to your problem, IMHO. The new cases still have burrs on the inside of the case mouth, although they should not. You could also try tumbling the cases for a good while. In any event, removing the burr is a prerequisite. Before you do that, select a dozen cases and measure for length to see if they are all identical, and at the minimum length. If not, then you might want to trim them before de-burring. When I get something like this, that is out of spec on one thing, i check as many other facets of the item as possible. If the mfr will ship a questionable item, then I check everything. YMMV. |
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It is coming from the burrs on the case mouth. When you expand the case mouth the expander plug knocks the burrs off. Most likely the answer. I agree with this assesment. Shouldn't really be a problem. I've not ever experienced this, loading .40 with RCBS Carbide dies. That's not exactly the same as what you're doing though. 
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