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01-11-2015, 10:25 AM
Sounds like oil in the system burned off to me too. Slugs can have more pressure but they will bulge the barrel first. If the barrel is OK than most likely there was a bunch of lube that had collected in the wrong place (possibly a result of how the gun was stored/transported) and it got vaporized. On my 1187's, I try not to lube the outside of the mag tube with anything but a dry lube like Archoil 2400 (Tungsten Disulfide) just for this reason.