I have two of the 3047's. They handle my B&J 8x10 no problem. I have found that if not super tight there is a tendency to rotate when inserting a holder. To solve that I tapped a existing indent in the QRplate for a 1/4-20 set screw which I set to project 1/4". I bored a 1/4" hole in the bottom of my 4x5 Wisner and fitted a brass sleeve into which goes the set screw. A simular hole I bored into the B&J steel rail head. Absolutely no wiggle.
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