Opening up a Remington 870 Magnum full choke barrel to accept steel shot would make sense in my books. Older 870's measure a smaller O.D. at the muzzle than the new barrels with removable choke tubes which limits the options for choke tube installation. I used to install Colonial Arms thin wall tubes in these older barrels and as previously mentioned Briley has some skinny tubes that will work out as well. D.H.
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