I would think just based on the fact that most of the measurements in the AR chamber are down to a thousandth of an inch, that this test will in no way indicate if you have a tight chamber or not. My thought is that you will get the same results with both kinds of chambers regardless of the ammunition used. What those results will be I couldn't tell you, but my hypothesis is that simply due to surface tension it will take some sort of violent action to remove the round from the chamber, whether that chamber is .223 or 5.56.
Last edited by Mac5.56; 11-19-10 at 01:10.
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