i realize man here do not like teh boss, but i just have a question. are they caliber specific?

Cuase i dont see one for the 204, and i kinda want one if i geta 204 ruger. i realize there louder and there more muzzle blast but I like the big barking sticks. I ve been around a 300 win mag with a boss and it doesnt bother me seeing as i shoot with ear plugs.