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Deprimed, resized and trimmed cases to 1.750 -- 1.752........loaded 55gr fmjbt with 21.6gr of H335 using CCI primers.........shot 80 rounds with no ftf's or fte's.......... Took home spent brass....inspected and measured........all cases are now 1.746 -- 1.748........ Is this normal? Shot out of DPMS AR-15.
Also read that you need to get case lube off of brass prior to firing due to possible increased pressures..... True or false?
Are the universal decapping dies and pins covered by warranty? Broke both within 100 cases on crimped primers? No biggie if not, I will be ordering more.
As always, your valued opinion is appreciated and your excellent products and service are 2nd to none.
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Posted by: dillon
Posted on: 2011-11-07 at 08:32:29 AM
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Don't worry about the fired case length. Clean, lube and resize, then measure again. They will grow after resizing.
You definitely want to remove case lube before firing the ammunition. If the cases have an appreciable amount of lube on them, then the case does not momentarily adhere to the chamber wall upon firing. This increases the thrust against the breechface, acting like an overpressure round. We suggest tumbling the loaded ammo about 10-15 minutes in plain corncob to remove case lube.
Decap pins are not covered under warranty, but the rest of the die is.
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Posted by: rsplante
Posted on: 2011-12-13 at 04:30:51 PM
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So there is no danger in tumbling (vibratory) a fully loaded 5.56 round? I've just been wiping the lube off, but it sure would be easier to tumble them.
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Posted by: dillon
Posted on: 2011-12-15 at 09:14:37 AM
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We recommend tumbling loaded rounds for 10-15 minutes in plain corncob. If necessary to remove the lube, add 1-2 tablespoons of alcohol to the media. Use a separate batch of media for removing case lube.
