My thoughts would be to have the smith do a chamber cast before he touches it to be sure the neck area in the chamber isnt to tight.Ink up a round that sticks,put sharpie al over the neck and straight lines down the body and try chambering the sticky round.If it removes the ink anywhere you will be able to see where it is tight.I would also get a ball mic and measure the thickness of all your necks and you will probably see some are thicker.This is why alot of reloaders turn the necks to get them concentric.Unfortunately this is a common problem on alot of factory rifles.Until you get into reloading for real precision you are at the mercy of the manufacturer of the ammo.Lapua brass is the most consistent and norma a close second.One thing you can do is measure the outside diameter of all the necks of the loaded rounds and see if they very all over.
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