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Ever have issues with it loosening while firing? I constantly have to tighten my screw on pistol cans, so much so that it turned me off from ever buying a screw on centerfire rifle can.
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Interestingly enough, my Triple-X always stays on tight, unlike many of my other cans. Mine's also from a while ago. I bought it in 2008, but it was "new-old stock" that had been sitting in someone's inventory for a while. I posted an X-Ray of it somewhere, and Mike indicated it was one of the older versions of that can.
If I'm worried and I want some extra insurance, I just use a couple of wraps of teflon tape around the barrel threads before threading the can on.
It's overkill for most of what I do with it - semi-auto .223, and the occasional supersonic .300 Whisper.