I have dedicated cans for almost every firearm, but I have used a Griffin Armament Recce 7 on a 20" Colt Sporter in 5.56, and it was incredibly quiet.
I would suggest not putting your 30 cal can on anything rimfire.
I ran my new ultra 9 on a 6.5 yesterday and was extremely happy. It seems as quiet or quieter than my sandman-S on a 223. The sandman-S 30 cal on my .223 is very similar to a friends Surefire 5.56 on his gun.