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You know I saw the vertical stringing and I wonder if Alleycat isn't on to something?
I had a Husqvarna rifle that would exhibit the same groupings until I identified that the stock inletting was insufficient on the forend and it was binding and reseating with each shot. There was no suppressor involved just a hunting rig in 7MM Mag but after restocking in a McMillan stock all the stringing issues disappeared. I could have cleaned up the forend on the old wood stock but wanted to switch it out anyway so it was a good excuse.
I wasn't aware of a theoretical air barrier issue but my cans are all traditional stack baffles. You may want to double check on the stock clearance as Alleycat suggests.
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