I just finished patterning my SP-10 with the Rhino .685 and the Nitro 4x5 copper with 7 heavyshot. The patterns were simply amazing at 40 yards. I did have one problem though, on my last shot the shell extracted about half way and the extractor tore part of the head off of the shell, blowing hot metal all over my hand and arm. Is this normal for these shells or is this too dangerous????