Looking for Bbl pressures for 300 Blk Out in a 7-1/2" ; 1:8 ; AR-15 set up. I have an Advanced Armament 9mm Can (pistol) (circa 2004) that I want to use but concerned about blowing it up. I believe supersonic 9mm creates around 33-35,000 psi so the can is rated for at least that pressure if I understand the basics of pressures in Bbls. if I use Subsonic 300 blk Out in the above set-up, if those Bbl pressures are similar, to 9mm, will I be safe in using my can or am I nuts for even thinking about it. Would love to speak with someone knowledgeable in this area of can pressures, Bbl pressures, etc. Ike