Blown primers generally mean a hot load. But, you are running it in an 8.5" barrel, which probably has a pistol length gas system. This gas port is much closer to the chamber end, which will increase pressures blowing back into the action. Adding a suppressor, this will also increase your pressures. So, shooting an 8.5" barrel with a short gas system suppressed, will certainly raise your pressure. If you have an adjustable gas port, close it up some to reduce the gas flow back into the action. If you don't have an adjustable gas block, then take off the suppressor and see if that helps. Without knowing what powder they used, it should be fairly hard to get a blk out load to blow primers. It's a smaller round that acts like a straight wall case. I've hot-rodded some of my personal ammo, and it will take a lot of pressure before it blows primers.
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