Not to steal the thread, buy I've actually had this problem--in spades. It was with Erma's .22 caliber KGP 69. In my case, however, the problem manifest by exclusively involving factory original mags. I can't remember if any combo actually fell out, but the mags that were too big in relation to a particular gun's mag well couldn't even be started in.
I broke it down into three gradations--large, medium, and small--by trying every mag in every gun and noting the results. Then I basically did what Randall is doing, just keeping track of which ones fit best in each gun by labeling with a marker.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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