If that doesn't stop you problem there is another animal that can surface.
YHM cans use fairly tight blast baffles. If your thread is not concentric, the group dispersion will be negatively effected.
My brother has an Ops 12th model suppressor- he mounted it with a crush washer (as it is designed to do) and we were experiencing 3-4MOA accuracy at 100yds. After a call to Ron at Ops Inc, I inspected it and found that the bore was nearly in contact with the bullet flight path on one side.
I remounted using a machined washer shim and alignment became near perfect. The weapon accuracy became ~1/2MOA.
You want a suppressor bore to be centered on the weapon bore, because the bullet will follow the column of air and will want to center itself in the bore to an extent.
So if your suppressor is pointing right, that is where it will be sending the bullet also. The phenomenon is accompanied by poor accuracy.
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