If your Miroku has Invector chokes, then I don't see why this wouldn't apply: https://www.browning.com/support/faq...MfOuxIgwdt6PTt
WILL ACCEPT ALL CURRENT FACTORY STEEL SHOT LOADS:
All Browning shotguns with the Standard Invector, Invector-Plus or DS choke tube systems, However, we do not recommend the use of Invector full or extra full chokes with steel shot. They pattern too tightly, and sometimes result in a "blown" pattern.
A Miroku 7000 should be the equivalent of a Browning Citori 325.
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