I have two 45/70 inserts for 12 gauge. Sadly it did not work out as I had hoped. With our 12 gauge side by sides there is a slight bend in the bArrels for regulation. The inserts do not benefit from this. My bullets crossed horribly even at 25 yards. With double rifles if the bullet is to light or to fast the bullets will cross paths before impact. If they are to heavy or to slow they will shoot apart.
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