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But, it's depleted!! In time it will be totally buzz free!! U-238 has a half life of 4.4 billion years, and U-235 is only 700 million years! Like I said, just a matter of time! I thought it could be...

I can't wait to see how this turns out! I'll have to dig up some brass, but I think mine may be 30mm. I can get some 25 though, 30 may be a bit big.