Odb moderator

So I have the Odb moderator in .30cal currently and wondering will the .30cal be to big of a opening for a .177?

PLUS SIZING A SILENCER IS COMMON PRACTICE WITH THE DONNY FL, BRAND , ( WHAT I HAVE ) WOULD HOLD TRUE WITH OTHER BRANDS AS WELL , I WOULD CONTACT THE PARTICULAR BRAND ODB, AND ASK THEM. WHAT THEY RECOMMEND .