If the rumors are true and the Virginia Beach shooter used a suppressor, it is time to buy yours now before the ATF goes all bump-stock ban on them and makes getting an NFA item impossibly difficult.
Some things to remember about cans.
You can shoot sub caliber through them, as long as they are pressure rated for it. So if you have both a 9mm and 45 ACP, you can shoot 9mm through a 45 can without an issue, as long as you get the proper thread adapter to fit your barrel. If in doubt, get the bigger can. The sound performance is hardly changed at all. I’ve shot 9mm and 40 S&W through my Ti-Rant 45 and can’t tell the difference.
Same with rifle cans. You can shoot 5.56 through a 7.62 can. Having done so, the sound of the 5.56 bullet going supersonic is louder than the extra gas released by the slightly larger bore diameter. If a can is rated for 308 Win or 300 Win mag you can shoot 300 AAC, but not the reverse.