Frame size....If all the 410 barrels sets are oooo and they are mostly fitted to OO frame 28ga. frames then fire pin spacing must be the same...? We must get that OOOO frame protatype in hand and mesure all dementions and weight to compair with a OO frame. Also... I now have a copy of the letter stating one BHE 410/28 set was made.... and was the only one made by Parker reproductions, signed by Jack Skues. Thanks all Kenny Graft SXS ohio...(-: