The blackout can be used with any .30 cal can. If you ONLY shoot it subsonic you can use a 9mm can.
You can also shoot sub caliber bullets through a can, example, I have a YHM 7.62 can and I demo it on my 5.56 AR all the time.
What you don't want to do is use rim fire ammo in a non serviceable can, the powers do not burn clean.
If you head over to www.silencertalk.com
forums you will find a wealth of knowledge.