Rugers don't have cylinder bushings. Bob's problem appears to be solved, but this is a case where correcting one problem, endshake, might create others, like excess headspace or excess barrel/cylinder gap.
A perceptible amount of endshake is common and no cause for concern unless it becomes excessive. What is excessive? I can't tell without handling the gun. But if I had a Ruger that I felt had excessive endshake, I would return it to Ruger, not use a local gunsmith or try a DIY fix.
Of course it doesn't help to fire "the most powerful ammo I can find" on anything like a steady basis. Sometimes I wish guns had a "red line" like the tach on cars so people would know that their hot loads WILL destroy the gun and sooner, not later.
Jim
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