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When we had match 1911s that didn't feed SWC bullets well due to tight chambers, we "gently" enlarged the chamber by sanding/polishing the chambers while function checking the feed/chambering from the magazine (we did not touch the ramp other than finish polishing).
Of course, this was done after we made sure the finished rounds were all within specs and others parts of the pistol were checked.
You may need to consider enlarging the chamber.
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