Not just Colts; it is pretty common to find Astras with plier/wrench marks on the barrel bushing lock because the owner didn't know to push in on the barrel bushing to turn it.
No problem with using modern ammunition; the pressure level has been held the same over the years; there is nothing in auto pistols like the black powder vs smokeless problem with revolvers, since the quick pressure spike of black powder made BP autoloaders almost impossible.
Jim
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