Did you do the pencil test?
... a sharpened #2 pencil is a perfect fit in a .308 barrel. Push one through the can, down the barrel, to check your clearance. (I learned this trick on TFL.)
Or maybe it's just a barrel harmonics problem? The combination of heavy bullets and the weight of the can is screwing things up?
Yes, stacking holes inside one another. Not walking up the paper.
So always good with no can...
Sometimes ok with can, sometimes not ok with the can.
How’s the bedding and action torque? Perhaps the weight of the can could also be causing some form of changes in barrel harmonics.
The key change seems to be suppressor related.
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Find a way to get another 50 FPS on that load by upping the charge or switching powder. You’ve got more recoil force and a slower bullet with that heavy and the gun may have started moving a c-hair before the pill is out of the can. That’s my official guess.
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