If you rule out the following:
1. Baffle strikes
2. suppressor moving on the QD mount
3. QD mount moving on the existing threads
..these are the only ideas I can think of beyond the above:
1. suppressor is acting a muzzle tuner, and this Federal Fusion load is hitting a narrow/bad node, causing variations in the ammo to be exaggerated.
2. The weight of the can may be causing the barrel to bounce off of the stock irregularly during firing. This is only really a problem with a barrel that is only barely free floating, or is in a flimsy stock. I'm assuming you have it in an aluminum bedded Medalist of some sort, not a Carbelite.
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