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New Contest Starting Now! This Target Haunts Me
Tell us about the one that got away, the flier that ruined your group, the zero that drifted, the shot you still see when you close your eyes. Winner will receive a free scope!
I think I would look into seeing if it could be nitride again. Cerakote is nice but I think would wear out from cartridge feeding and magazine insertion.
You'll have break down the sequence into steps and check dimensions after each step.
For example your first step is to resize the brass and push out the primer. After you resize a case can you slide a bullet into the case?
I'm only familiar with the AI AT action as a flat bottom design. On the AT rifles Accuracy International bonded the action to the chassis as well as screw/bolt it down. The more recent AI model doesn't bond the action to the chassis but it uses 6 screws/bolts to keep it from shifting.
Have you removed the firing pin assembly and checked for interference? For example there could be build up of oil or grease. Or the firing pin spring could be dragging inside the bolt body.
If it's an older 591, no problem. If there is a newer 591, maybe.
I believe the older AICS had some interference with a Jewell trigger. It seems the more recent chassis have a little larger opening for various triggers.