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Roger, I would go with Advance Armament's recommendation for safety and warranty reasons. Just my opinion. Cheers!
If they are saying that it will not work with it, don't use it. They specifically say that because it is not rated for the pressures the 300 PRC has, and can lead to a catastrophic failure that can damage the suppressor, the firearm, and you. Should damage happen because you used a suppressor that is not rated for the firearm it is mounted to, that would be grounds for denial of warranty work from both companies due to intentional misuse. Just get a suppressor that is rated for 300 PRC, or use earplugs.