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Leading near the end of the barrel
is often an indication of lubricant failure on lead bullets. But, I am assuming that the barrel is pretty short for a .40 S&W, so maybe not in your case. Another possibility is that our bore gets larger near the muzzle, which allows blowby and causes leading. You can probably feel that condition by pushing a tight, lubricated patch through the bore after you have cleaned it.
SL1
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