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It’s not the powder. Last night I broke it down to clean the bolt and carrier. I got a lot of chunks out of the cylinder for the bolt. There are also copper flakes with those chunks to.
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It's a combination of crummy powders being used these days for some factory loads and obviously, plated rather than jacketed bullets
which have also been popping up in factory loads. Polishing the Bolt tail with super fine Wet or Dry (1500 or 2000 grit) as Ron mentioned
will help immensely. Even to the point of holding it tight around the gas rings. The rings will turn with the paper but that area of the
bolt will be polished too. If you stop the crap from sticking to the bolt, your DI-45 will run just fine. Also running the tail of the bolt
area dry helps as you have mentioned doing. I have a number of Ron's uppers in 45 acp and other calibers and these suggestions work.
Dave in Florida