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I am assuming you have used this can before with supersonic rounds on this rifle?
If not, did you do a visual check down the barrel and suppressor to make sure it looked lined up?
What are the rifle and barrel specifics?
What was the velocity of the rounds you shot?
Round holes on a target at 100 yards doesn't mean that they were not on the edge of being stable.
Subsonic BTHPs are tricky to get to work correctly in certain weights with slower twist rates.
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