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Hi, Coinneach,
By the time the gun is 1/2 inch out of battery, the round should be lined up with the barrel, with its rim under the extractor. If it is not, we talk magazine or rough breech face or rough extractor, or smoothing the barrel throat.
If the round is lined up, check the firing pin stop to make sure it is not hanging up on the hammer. Then check the barrel skirt to see if it is forcing the barrel up before the lugs are in place. This is a timing problem and easily solved.
You have worked over a few things that could not possibly be the problem (sear?) but you seem to have gotten the areas where some stoning would help.
Maybe George has some better ideas.
Jim
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