I would assume that your original 26" IC/M barrels mike out at ~ .006/.014 or so and of course your original 28" barrels are ~ .014/tighter than H---. Given that, it would be an easy choice, if this were my gun, to have this additional set of barrels choked .003/.006. IMHO, undoubtedly this choking would prove out to be the most useful for your intended purpose without destroying the usefulness of your original barrel sets.
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Wild Skies
Since 1951
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