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You can use a 9mm can on a 300blk if you run subsonic only. But most 9mm cans will have a LID device (sorta like a shock absorber). You would want to switch it over to a solid mount when shooting from rifle with subs. If you plan to run 300 blk super sonic, I would get a dedicated 30 cal can. The do-all cans are ok, but they aren't great at anything. You would also want to look to minimize POI shift. Some cans are better than others at this.
I would say get a Ti 30cal can for your .556 and 300blk and a dedicated 9mm can. But you will sacrifice some sound with a larger end cap hole for the 556. My experience is with Surefire, SWR and YHM.
I would say get a Ti 30cal can for your .556 and 300blk and a dedicated 9mm can. But you will sacrifice some sound with a larger end cap hole for the 556. My experience is with Surefire, SWR and YHM.